Communications

	No:181 - Acoustics (209)
	No:342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation) (357)
	No:340 - Communications: electrical (1048)
	No:367 - Communications, electrical: acoustic wave systems and devices (210)
	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)