MP3 Surround 1970-01-01
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Magic Mic 1970-01-01
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Magnetostatic loudspeaker 1970-01-01
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Nady Systems, Inc. 1970-01-01
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Nevaton 1970-01-01
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Optophone 1970-01-01
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Oxford University Tape Recording Society 1970-01-01
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PMCD 1970-01-01
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PSB Speakers 1970-01-01
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Parametric stereo 1970-01-01
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Phasor (sound synthesizer) 1970-01-01
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PhatBox 1970-01-01
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Photosonic 1970-01-01
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Ping-pong recording 1970-01-01
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Pitch control 1970-01-01
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Pocket Disc 1970-01-01
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Punch in/out 1970-01-01
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Q-LAN 1970-01-01
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RCA Type 77-A microphone 1970-01-01
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Radio pack 1970-01-01
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