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Class Number Class Name Patents
181 Acoustics 22,225
367 Communications, electrical: acoustic wave systems and devices 22,200
342 Communications: directive radio wave systems and devices (e.g., radar, radio navigation) 55,771
340 Communications: electrical 190,472
343 Communications: radio wave antennas 44,835
329 Demodulators 4,425
358 Facsimile and static presentation processing 103,971
D10 Measuring, testing, or signalling instruments 26,124
370 Multiplex communications 262,928
398 Optical communications 47,793
331 Oscillators 34,861
375 Pulse or digital communications 140,583
346 Recorders 6,165
D14 Recording, communication, or information retrieval equipment 59,392
116 Signals and indicators 11,421
455 Telecommunications 274,168
178 Telegraphy 6,092
379 Telephonic communications 106,351
386 Television signal processing for dynamic recording or reproducing 30,232
334 Tuners 815
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