Audio Tape (14 companies)
		Cable Layers/Trenchers (1 companies)
		Duplication Systems (14 companies)
		Editing Suite Rentals (3 companies)
		Locking Systems (5 companies)
		Market research (1 companies)
		Microwave Diodes (1 companies)
		Multi-Channel Insertion (10 companies)
		Screen/Projection Materials (10 companies)
		Slide Creation (1 companies)
		Video Effects Equipment (15 companies)

		Custom Display (11 companies)
		News Display (6 companies)
		Stock Exchange Display (3 companies)
		Tally Systems (1 companies)

		AM (14 companies)
		Arrays (11 companies)
		Earth Station (18 companies)
		Fixed (13 companies)
		FM (23 companies)
		Microwave (21 companies)
		Omni-Directional (17 companies)
		System Design (12 companies)
		Transportable (12 companies)
		TV (22 companies)
		UHF (25 companies)
		VHF (25 companies)

Professional (19 companies)

		Amplifiers (35 companies)
		Audio Level Meters (19 companies)
		Belt Pack Systems (14 companies)
		CD Players (18 companies)
		Compressors (16 companies)
		Connectors (36 companies)
		Consoles (19 companies)
		Digital Equipment (27 companies)
		Headphones (24 companies)
		High Speed Cassette Duplicators (12 companies)
		Intercoms (21 companies)
		Limiters (14 companies)
		Microphones (26 companies)
		Mixers (26 companies)
		Monitors (24 companies)
		Preamplifiers (22 companies)
		Processors (22 companies)
		R-DAT (16 companies)
		Recorders (17 companies)
		Rental (11 companies)
		Sibilance Processing (7 companies)
		Speakers (25 companies)
		Tape, Cartridges, Accessories (13 companies)
		Turntables (10 companies)