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Communications
No:181
Acoustics (
209
)
No:367
Communications, electrical: acoustic wave systems and devices (
210
)
No:342
Communications: directive radio wave systems and devices (e.g., radar, radio navigation) (
357
)
No:340
Communications: electrical (
1048
)
No:343
Communications: radio wave antennas (
239
)
No:329
Demodulators (
85
)
No:358
Facsimile and static presentation processing (
244
)
No:D10
Measuring, testing, or signalling instruments (
137
)
No:370
Multiplex communications (
418
)
No:398
Optical communications (
218
)
No:331
Oscillators (
216
)
No:375
Pulse or digital communications (
249
)
No:346
Recorders (
177
)
No:D14
Recording, communication, or information retrieval equipment (
362
)
No:116
Signals and indicators (
327
)
No:455
Telecommunications (
644
)
No:178
Telegraphy (
185
)
No:379
Telephonic communications (
855
)
No:386
Television signal processing for dynamic recording or reproducing (
136
)
No:334
Tuners (
90
)
# 20
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