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Class Information
Number: 122
Name: Liquid heaters and vaporizers >
Description: This class relates to heating liquids, generating vapors from liquids, treating the vapors generated for use, such as superheating or cooling them, and conserving the heat remaining in the liquid or vapor after a part of the heat energy has been made use of for any purpose. To bring a liquid heater into this class, the chamber, receptacle or conduit in which the liquid is heated must be fluid tight.










Class Number Class Name No. of Patents
122/35

Accumulator

16
122/DIG.2

Air heater - indirectly heated

20
122/DIG.1

Air heater

21
122/5.51

Air-injected

6
122/5.52

Combustion gas and vapor contact

18
122/29

Annular firebox

2
122/448.1

Automatic control of fluid fuel and water

108
122/448.2

Having fuel or feed bypass

4
122/448.3

Multiple boiler regulation

46
122/448.4

Once through

13
122/36

Auxiliary steam heater

7
122/493

Braces and stays

18
122/494

Casings

72
122/21

Chemical

27
122/406.1

Circulation

80
122/406.2

Having anticavitation devices

1
122/408.1

Having internal conduit

5
122/409

Horizontal flue boiler

4
122/410

Return fire tube

0
122/408.2

With internal geyser tube

2
122/406.3

Having restrictors and orifices

23
122/407

Injector

11
 

Mechanical

 
122/411

Internal

4
122/406.4

Once through

71
122/406.5

With start-up operations

42
122/379

Cleaning

274
122/380

Agitating circulator

22
 

Blow off

 
122/381

Bottom and surface

15
122/382

Bottom

94
122/383

Internal conduit

21
122/384

Ejector

7
122/385

Mud ring

0
122/386

Pan

2
122/387

Scraper

7
122/388

Valved

7
122/389

Surface exit

0
122/390

Fluid jet

139
122/391

Horizontal fire tube boiler

30
122/392

Water tube boiler

151
122/393

Mud drum

3
122/394

Pans

3
122/395

Sandblast

6
122/396

Systems

21
122/397

Trapped circuit

3
122/398

Feeding water

5
122/399

Surface and bottom exit

0
122/400

Surface exit

0
122/401

Chemical feeder

11
122/402

Circulating pump

6
122/403

Feed heater

4
122/404

Steam injector

7
122/405

Wash-out nozzle

42
122/37

Compartment

20
 

Auxiliary

 
122/38

Draft regulator

3
122/DIG.5

Critical pressure

0
122/496

Crown sheets and stays

2
122/495

Crown sheets protecting

0
122/DIG.6

Damper-directed radiation

1
122/412

Feed heaters

41
122/413

Ash pan

0
 

Boiler circuit

 
122/414

Feed-injected

20
 

Circulatioon

 
 

Surface exit

 
 

Mechanical pump

 
122/415

Feed-injected

8
122/417

Drip plate in boiler

1
 

Fire-engine boiler

 
 

Auxiliary

 
122/418

Attached

0
122/419

Detachable

1
122/422

Furnace gases and steam

4
122/420

Furnace gases

17
 

Horizontal fire tube boiler

 
122/423

Smoke box

0
122/424

Exhaust pipe

0
122/425

Furnace gases and steam

3
122/426

Water tube

0
122/427

Smoke chamber

0
122/428

Internal conduit

3
122/429

Automatic sediment valve

2
122/430

Blow-off delivery

0
122/431

Filter in boiler

1
122/432

Furnace gases

0
122/433

Trap outside boiler

0
122/434

Locomotive tender

1
122/421

Offtake flue

50
122/435

Pan in steam space

2
122/436

Spray

2
122/437

Safety valve

2
122/438

Spray to steam space

21
122/439

Stack

1
122/441

Steam

33
122/442

Injected

16
 

Superposed

 
122/443

Open to steam space

4
122/444

Water tube boiler

10
122/451R

Feeders

55
 

Automatic

 
122/451.1

Thermally controlled

31
122/451.2

Pressure-operated valve

13
122/452

Boiler pressure

11
 

Gravity

 
122/456

Automatic

6
122/457

Heater

2
122/458

Heater

5
122/451S

Once through

50
122/DIG.7

Feeding air

12
122/39

Film

20
122/42

Fire and water tube

2
122/43

Fluid fuel

6
122/44.1

Fire tube

13
 

Flue

 
122/47

Horizontal

2
122/48

Vertical

2
122/45

Fluid fuel

1
122/49

Horizontal and vertical

5
 

Horizontal or inclined

 
 

Water firebox

 
122/50

Flue

1
122/51

Horizontal

5
 

Central firebox

 
122/54

Double outlet

0
122/55

Cylinder

2
 

Depending fire tube

 
122/56

Rear of bridge wall

0
 

Double water firebox

 
122/57

Alternate smoke return

0
122/58R

Drop water firebox

0
122/59

Circulation conduit

0
 

Double

 
122/60

Alternate smoke return

1
122/61

Drop water baffle

1
122/58FB

Fire box construction

1
122/62

Front and rear water baffle

1
122/63

Front water baffle

0
122/64

Interposed combustion chamber

2
122/65

Rear water baffle

0
122/66

Water coking chamber

0
 

Water grate

 
122/67

Intermediate draft

1
122/68

Water tube

2
 

Feed heater

 
122/69

Check-valved

0
122/70

Feeding air

2
122/71

Solid baffle

0
122/52

Plural

5
122/53

Water tube

2
122/72

Projecting into firebox

0
122/73

Drop water firebox

0
 

Return and reverse

 
122/74

Drop water firebox

2
122/75

Return fire tube

9
122/76

Drop water firebox

1
122/77

Internal water tube

0
 

Water firebox

 
122/78

Flue

0
122/80

Subjacent flue

0
122/81

Subjacent transverse fire tube

0
122/79

Subjacent water arch

0
 

Superjacent feed heater

 
122/82

In communication

0
122/83

Transverse diaphragm

2
 

Two diameters

 
122/84

Great diameter over firebox

1
122/85

Small diameter over firebox

0
122/86

Water firebox

0
122/87

U-coupling

3
122/88

Upper drum

0
 

Water arch

 
122/89

Rear of fire tube

1
122/90

Water firebox

0
 

Firebox water heater

 
122/91

Trapped circuit

2
122/92

Magazine

0
122/93

Offset

1
122/94.1

Water tube type

0
122/95.1

Plural with common combustion chamber

4
122/95.2

Multiboilers

4
122/96

Superposed

0
 

Water grate

 
122/97

Downdraft

0
122/98

Updraft

0
 

Water tube type

 
122/100

Interposed flue

0
 

Water tube

 
122/99

Straddle

0
122/101

Water smoke box

0
 

Water tube

 
 

Horizontal

 
122/102

Over bridge wall

0
122/103

Rear of fire tube

1
 

Rearwardly declined

 
122/104

Over bridge wall

0
 

Rearwardly inclined

 
122/105

Over bridge wall

0
122/106

Water wall

1
122/107

Drop water firebox

0
122/108

Subjacent water tube

0
122/109

Inclined

0
122/46

Magazine

2
 

Transverse

 
122/110

Horizontal boiler

3
122/111

Vertical boiler

0
122/112

Water firebox

0
122/113

Water tube

0
122/114

Vertical

11
122/116

Central fire dome

2
122/117

Central magazine

0
 

Circulation tube

 
122/118

Internal

2
122/119

Cylinder

2
122/115

Fluid fuel

3
122/120

Offset firebox

1
122/121

Return fire tube

11
122/122

Water firebox

3
122/123

Separate compartment

5
122/124

Side magazine

1
122/125

Top water chamber

1
122/126

Water firebox

3
122/127

Annular

1
122/128

Central magazine

1
 

Water grate

 
122/129

Downdraft

0
122/130

Water tube

4
122/131

Internal

0
122/132

Radial loop

0
122/133

Spur

0
122/134

Volute

8
122/44.2

With baffle in flue

62
122/40

Flasher

90
122/41

Fluid fuel

8
122/135.1

Flue

14
122/135.2

Alternative stack

1
122/136R

Horizontal

51
122/139

Drop water firebox

0
122/136C

Horizontal-corrugated or finned

11
122/140.1

Internal water tube

1
122/140.2

Having water tube in flue

0
 

Longitudinal

 
122/141

Drop water firebox

0
122/142

Return fire tube

4
122/143

Spur

0
122/144

Subjacent firebox

0
122/145

Transverse

3
122/146

Drop water firebox

0
122/147

Return fire tube

0
122/148

Water firebox

0
122/137

Plural

0
122/138

Water tube

7
122/149

Return fire tube

46
122/150

Rear water tube

1
 

Water smoke box

 
122/151

Separate

0
122/152

Water grate in flue

1
122/153

Water tube

6
122/154

Over bridge wall

0
122/135.3

Sinusoidal flue

5
122/155.1

Vertical

20
122/157

Central magazine

1
122/158

Water jacket

14
 

Circulation tube

 
122/159

Internal

14
122/160

Concentric shell

16
122/162

Central magazine

6
122/161

Fluid fuel

20
122/163

Exterior drum

2
122/156

Fluid fuel

13
122/155.4

Having corrugated flue

3
122/155.3

Having exterior heating flue

0
122/155.5

Having undulating flue

5
122/164

Insulated outlet flue

6
122/165

Internal water heater

1
 

Spiral water conduit

 
122/183

Fluid fuel

7
 

Standpipe

 
 

Water tube

 
122/184

Annular firebox

1
122/185

Loop

0
122/186

Spur

0
122/187

Transverse fire tube

0
122/155.2

With flue baffle

62
122/166.1

With internal water tube

3
122/168

Central magazine

0
122/169

Coil

14
122/170

Header

1
122/171

Contracted inlet

0
122/167

Fluid fuel

1
122/172

Header

3
122/173

Horizontal spur

0
122/174

Internal fire tube

4
122/166.2

Loop-type tube

1
122/175

Offset water firebox

1
122/176

Transverse

5
122/177

Fluid fuel

3
122/178

Vertical aligned fire tube

0
122/179

Fluid fuel

1
122/180

Spur water tube

0
122/181

Vertical spur

2
122/182.1

With return fire tube

10
122/182.2

Having symmetrical arrangement of tubes

16
122/182.3

Having tubes offset from firebox

2
122/22

Fluid and solid fuel

31
122/23

Fluid fuel

12
122/24

Explosion

52
 

Plural burner

 
122/25

Superimposed

4
122/501

Fluid-displacer

0
122/502

Fluid fuel

0
122/10

For fluid fuel burner

3
122/26

Friction generator

208
122/497

Fronts

6
122/498

Doors

22
122/499

Mouths

1
122/500

Water firebox

1
122/503

Fuel baffles

1
122/DIG.3

Gas flow baffles

6
122/5

Gas-producer

47
122/367.1

Heat transmitter

121
122/367.3

Corrugated and finned heat transmitters

114
122/367.2

Double immersed heat transmitters

15
122/367.4

Pebble furnaces

17
 

Horizontal cylinder

 
122/188

Drop water baffle

1
 

Offset subjacent firebox

 
122/189

Water roof

0
122/190

Water tube

1
 

Subjacent fire tube

 
122/191

Beyond bridge wall

0
122/192

Water bridge wall

0
122/193

Water firebox

0
122/194

Water tube type

0
122/195

Water tube

2
 

Feed heater

 
122/196

Check-valved

0
122/197

Lateral-longitudinal

3
122/198

Lateral-vertical

0
122/199

Firebox

0
122/200

Over fuel grate

0
122/201

Subjacent internal fire tube

0
122/202

Trapped circuit

0
 

Water grate

 
122/203

Downdraft

0
122/204

Intermediate draft

0
122/205

Multiple series

0
122/206

Solid and water bar

1
122/207

Updraft

0
122/31.1

Indirectly heated separate injected fluid

131
122/31.2

Submerged flame

37
 

Indirectly heated

 
 

Separate fluid

 
122/32

Surface

247
122/33

Furnace

109
122/34

Separator

84
122/6R

Industrial

11
122/6B

Bosh plates

18
122/6.5

Port

17
122/6C

Skew arch coolers

3
122/6.6

Tuyeres

30
122/6.7

Forge

1
122/7R

Waste heat

343
122/7B

Additional burner

50
122/7D

Carbon monoxide

4
122/7A

Steel converter

6
122/7C

Waste sulfite

16
122/8

Water firebox

0
122/9

Water tube type

1
122/6A

Water-cooled walls

187
122/30

Magazine

12
122/4R

Miscellaneous

67
122/4D

Catalyst

739
122/4A

Electric boiler

46
122/4C

Water-cooled stoker

1
 

Noncombustible heater

 
122/27

Surface

9
122/28

Water in contact

23
122/DIG.4

Once through boilers

6
122/1R

Plants

68
122/1A

Air heaters

44
122/1C

Feed water heaters

39
122/2

Garbage

46
122/3

Motor vehicle

10
122/1B

Once through

29
 

Plate

 
 

Zigzag conduit

 
122/208

Fluid fuel

2
122/DIG.10

Portable units

12
 

Regulation

 
 

Fuel and water

 
 

Automatic control

 
122/449

Solid fuel

26
122/446

Fluid fuel

13
122/447

Cutoff

14
122/450

Suspended boiler

4
122/DIG.11

Removable steam-heating elements

5
122/11

Rotary

23
122/12

Rotatably supported

1
122/504

Safety devices

161
122/504.2

Alarms or indicators

45
 

Fire extinguishers

 
122/505

Float-controlled

4
122/504.3

Fusible control

11
122/506

Pressure-controlled

4
122/504.1

Fusible control

15
122/507

Self-closing valve

34
122/209.1

Sectional

18
122/231

Accessories

0
122/209.2

Feeding air

1
122/210

Fluid fuel

3
122/211

Fluid or solid fuel

4
 

Horizontal sections

 
122/214

Superimposed

9
122/215

Central connection

1
122/216

Fluid fuel

2
122/217

Water firebox

0
122/218

Water firebox

2
122/219

Central magazine

0
 

Water tube

 
 

Internal fire tube

 
122/220

Water firebox

0
122/213

Plural firebox

3
 

Vertical sections

 
122/221

Annularly positioned

2
122/222

Central magazine

0
122/223

Longitudinally positioned

2
122/224

Casing

0
122/225R

Transversely positioned

7
122/226

Casing

0
122/227

Divided section

1
122/228

Divided section

0
122/225F

Feeding air

0
122/229

Water grate

0
122/225B

Water heater in boiler

0
122/225A

Water heater in flue

1
122/230

Two-section

1
122/232

Water grate

1
122/212.1

With magazine

0
122/212.2

With return or alternate flue

0
 

Separators

 
122/488

Boiler circulation

71
122/489

Boiler return

25
122/490

For tilting boilers

1
122/491

Interior of boilers

38
122/492

Steam dome

35
 

Fire tube (122/unnumbered)

 
 

Fire tube and water tube (122/unnumbered)

 
 

Water tube (122/unnumbered)

 
 

Below boiler (122/unumbered)

 
 

Casing (122/unnumbered)

 
122/13.01

Stand boiler (e.g., water heater, etc.)

137
122/19.2

And casing feature for stand boiler or external water tank therefor

125
122/14.1

And condition responsive feature

67
122/14.2

Controls burner

81
122/14.21

By other than temperature of water

76
122/14.22

By temperature of water in a water containing chamber or external tank

72
122/14.3

Having water flow control feature

70
122/14.31

Using valve actuated by flow or pressure (e.g., check valve, etc.)

58
122/13.3

And delivery means to dispensing feature

96
122/17.1

Fluid fuel burner

92
122/18.5

And external water tank

12
122/18.1

Having heat exchange feature

101
122/18.3

Fire tube or flue surrounded by water containing chamber

85
122/18.31

Penetrates one side of water chamber to another

124
122/18.2

Preheater

60
122/18.4

Water tube surrounded by burned fuel

103
122/17.2

Liquid fuel burner

43
122/15.1

Heated by liquid or steam (e.g., indirect heating, etc.)

68
122/16.1

Solid fuel burner

52
122/19.1

Water containing chamber or external tank having circulation feature within

69
122/508

Steam domes

2
122/459

Steam treatment

38
122/479.1

Automatic heat regulation of superheater

27
122/479.5

Having dampers

4
122/479.3

Having flame positioning

10
122/479.2

Having gas recirculation

9
122/479.7

Once through

19
122/479.6

Plural furnaces

4
122/479.4

With variable firing

0
122/460

Boilers with superheaters

36
 

Fire tube boiler

 
 

Horizontal

 
122/461

Superheater

1
 

In fire tube

 
122/462

From smoke box

0
 

Interior steam space

 
122/463

Internal fire tube

2
 

Smoke box

 
122/464

Fire tube

0
122/465

Steam tube

1
122/466

Superheater and feed heater

7
 

Vertical

 
122/467

Superheater

10
 

Flue boiler

 
 

Vertical

 
 

Internal water tube

 
122/468

Superheater

12
 

Horizontal boiler

 
 

Superheater

 
122/469

Rear of firebox

0
122/470

Waste-heat flue

26
 

Superheater

 
122/480

Damper-controlled

8
122/482

Fire tube in steam space

3
122/481

Firebox

2
122/483

Indirectly heated

66
122/484

Separate charges

0
122/485

Separate furnace

3
122/486

Steam dome

3
122/487

Water-injected

31
 

Water tube boiler

 
 

Declined over bridge wall

 
 

Front and rear header

 
 

Declined drum

 
122/471

Superheater

1
 

Longitudinal drum

 
122/472

Superheater

3
 

Longitudinal drum

 
122/473

Superheater

1
 

Over bridge wall

 
122/474

Superheater

1
 

Standpipe

 
 

Spur tube

 
122/475

Superheater

0
122/477

Superheater and feed heater

7
122/476

Superheater

19
 

Transverse drum

 
122/478

Superheater

12
122/509

Submerged steam chamber

0
122/20R

Subsidiary

16
122/20A

Subsidiary-heater firebox

21
122/20B

Subsidiary-heater offtake flue

180
122/510

Supports

258
 

Tank

 
122/233

Horizontal

4
122/234

Vertical

13
122/DIG.14

Tube replacement

8
122/512

Tube sheets

47
122/DIG.13

Tubes - composition and protection

64
122/511

Tubes and connections

111
122/DIG.15

Valves

1
122/368

Water firebox

1
122/369

Mud ring

0
122/370

Plural

0
122/371

Water grate

3
122/373

Cage

2
122/374

Grate structure

4
122/375

Solid and water bar

0
 

Plural firebox

 
 

Superimposed

 
 

Water grate

 
122/372

Updraft

1
122/376

Progressive feed

4
 

Water firebox

 
 

Solid and water bar

 
122/377

Updraft

0
122/378

Updraft

0
122/235.11

Water tube

65
122/242

Capillary

3
122/243

Fluid fuel

0
 

Coil or loop

 
122/244

Central standpipe

5
122/246

Annular firebox

2
122/245

Fluid fuel

6
122/247

Coil

11
 

Horizontal

 
122/248

Fluid fuel

26
122/249

Vertical

19
122/251

Central magazine

3
122/250R

Fluid fuel

44
122/250S

Standpipe

0
122/252

Water firebox

0
122/253

Cross

2
122/254

Over bridge wall

2
 

Over firebox

 
 

Longitudinal

 
 

Header

 
122/255

Drum

1
 

Transverse

 
 

Header

 
122/256

Drum

1
 

Transverse

 
 

Header

 
122/257

Drum

2
122/235.19

D-type tube

7
122/235.21

Multiple d-type tubes

2
122/258

Downflow

4
122/259

Drum type

1
122/365

Drums and couplings

9
122/241

Firebox in drum

0
122/260

Flat

2
122/261

Volute

6
122/236

Fluid fuel

5
122/235.16

For plural fluids

6
122/235.17

Having baffles

17
122/235.29

Having forced circulation system

7
122/240.1

Having plural fireboxes

8
122/240.3

Parallel connected

5
122/240.2

Series connected

5
122/235.28

Having rotary flame

8
122/235.18

Having seals

3
122/235.26

Having slag and ash disposal

14
122/235.31

Having specific intenal drum and head structure

3
122/235.23

Having specific tube patterns

70
122/235.15

Headers and connections

37
 

Headers

 
122/360

Closures and couplings

12
122/361

Cleaning

5
122/362

Concentric tube

4
122/363

Drum

1
122/364

Tube closures

4
122/262

Horizontal

6
122/263

Over bridge wall

0
122/264

Over firebox

6
122/265

Inclined

2
122/266

Internal fire tube

3
122/267

Horizontal

0
122/268

Inclined

0
122/269

Plural fire tube

1
122/270

Straddle

0
122/271

Vertical

0
122/272

Central magazine

0
122/235.27

Locomotive-type

1
122/273

Longitudinal upper drum

1
122/274

Fluid fuel

0
122/275

Loop

2
122/276

Firebox enclosing

7
122/277

Over bridge wall

0
 

Over firebox

 
122/278

Cross

0
122/279

Horizontal

3
 

Rear of bridge wall

 
122/280

Bridge wall header

0
122/281

Standpipe

1
122/282

Vertical

0
122/283

Fluid fuel

4
122/237

Magazine

0
122/238

Offset firebox

1
 

Over bridge wall

 
122/284

Headers at right angles

0
122/285

Transverse water baffle

0
 

Water grate

 
122/286

Downdraft

0
122/287

Intermediate draft

0
 

Over firebox

 
122/288

Headers at right angles

0
 

Water grate

 
122/289

Updraft

1
 

Rearwardly declined

 
 

Over bridge wall

 
122/290

Front and rear header

2
122/291

Horizontal-longitudinal drum

0
122/292

Firebox tube

2
122/293

Longitudinal water baffle

0
122/294

Water wall

0
122/295

Internal water tube

0
122/296

Longitudinal-declined drum

0
122/297

Transverse drum

0
 

Over firebox

 
 

Front and rear header

 
122/298

Horizontal-longitudinal drum

0
122/299

Transverse drum

0
122/300

Tubes beyond side wall

0
 

Plural upper transverse drum

 
122/301

Plural lower transverse drum

0
122/302

Single lower transverse drum

0
 

Rearwardly inclined

 
 

Over firebox

 
 

Front and rear header

 
122/303

Transverse drum

0
122/235.24

Screens

4
122/235.25

Floor screens

2
 

Separate banks

 
122/304

Opposite fireboxes

0
122/305

Spur

3
122/306

Bridge wall header

0
122/307

Central standpipe

0
122/309

Annular firebox

0
122/310

Central magazine

0
122/308

Fluid fuel

0
122/311

Cross

0
122/312

Horizontal-longitudinal drum

0
122/313

Over bridge wall

0
 

Over firebox

 
122/314

Central header

0
122/315

Declined

0
122/316

Horizontal

1
122/317

Straddle

0
122/318

Vertical

3
122/320

Central magazine

0
122/319

Fluid fuel

1
122/321

Standpipe

2
122/323

Annular firebox

0
122/322

Fluid fuel

1
122/324

Straddle

0
 

Plural upper drum

 
122/325

Plural lower drum

0
122/326

Cross

0
 

Single upper drum

 
122/327

Plural lower drum

2
122/329

Cross

1
122/328

Fluid fuel

3
122/330

Plural firebox

2
122/239

Superimposed firebox

1
122/331

Transverse horizontal drum

5
122/235.14

Tube structure

49
122/332

Vertical

6
122/335

Annular firebox

1
 

Annular lower drum

 
122/338

Annular upper drum

6
122/339

Central magazine

1
122/340

Tubes over firebox

0
122/341

Fire tube upper drum

0
122/342

Spur tube upper drum

0
122/343

Upper drum

3
122/344

Central magazine

2
122/345

Beyond bridge wall

0
122/346

Gas return

2
 

Longitudinal upper drum

 
122/347

Longitudinal lower drum

6
122/333

Fluid fuel

5
 

Internal fire tube

 
122/348

Fluid fuel

5
122/336

Offset firebox

7
122/337

Elevated

1
122/349

Over firebox

0
122/350

Gas return

1
 

Plural upper longitudinal drum

 
122/351

Plural lower longitudinal drum

0
 

Plural upper transverse drum

 
 

Plural lower transverse drum

 
122/352

Offset firebox

1
122/334

Side magazine

0
122/235.22

Wall loop

10
122/235.12

Wall structure

81
122/353

Water grate

5
122/354

Downdraft

0
122/235.32

With combustion

2
122/235.33

With convection zone regulation

2
122/235.13

With fuel burners having posts and tuyeres

18
122/235.34

With parallel multiple fireboxes

2
122/235.35

With serial multiple fireboxes

2
122/355

Zigzag

5
122/356

Fluid fuel

24
 

Over bridge wall

 
122/357

Longitudinal drum

1
122/358

Transverse drum

0
122/359

Over firebox

4
122/DIG.16

Welding

5
122/366

Wick

84
 
 
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