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Communications
Class Information
Number:
181/247.gtoreq.251
Name:
Acoustics
>
Description:
Sub-classes under this class:
Class Number
Class Name
Patents
181/
Speaking tubes
0
181/.5
Miscellaneous
98
181/101
Geophysical or subsurface exploration
51
181/123
Echo system
10
181/125
Sound location
15
181/126
Anatomic or prosthetic relation
25
181/138
Mechanical telephone
6
181/139
Wave generation and detection
27
181/140
With vessel
16
181/141
Combined
149
181/142
Wave generation
61
181/143
Moving sound producer or deflector
12
181/144
Plural diaphragm sound sources
251
181/148
Diaphragm and enclosure
239
181/157
Diaphragm
72
181/175
Sound-modifying means
153
181/30
Auditorium
70
181/400
Wave coupling
19
181/403
Refrigerator compresssor muffler
191
181/404
Hobby craft engine muffler
5
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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