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  • Terms: communications
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synthetic quartz crystal

synthetic quartz crystal

Valpey Crystal Company
before 1947
GenRad model 1971-9601, 1-inch ceramic microphone

GenRad model 1971-9601, 1-inch ceramic microphone

General Radio Company
circa 1984
microphone, calibrated

microphone, calibrated

General Radio Company
circa 1970
radio antenna

radio antenna

American
1930-1950
needle force gauge

needle force gauge

Acoustic Research, Inc.
after 1954
A/C adapter for transcriber

A/C adapter for transcriber

Olympus
after 1988
headphones

headphones

Olympus
after 1988
phonograph speed indicator (two)

phonograph speed indicator (two)

American
1900-1960
transmission decibel and standard slide rule

transmission decibel and standard slide rule

Raytheon Manufacturing Company
Copyright 1966
transcriber foot pedal

transcriber foot pedal

Olympus
after 1988
voice/writer tape deck

voice/writer tape deck

3M Company
1971-1972
Phelps single crown receiver (or transmitter)

Phelps single crown receiver (or transmitter)

Societé du Telephone Edison
1879-1880
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