Prior to the deregulation of telephony in many countries of the world, it was illegal to make a direct electrical connection to the telephone network, so technicians needed to concoct a work-around. In 1955 the modulator/demodulator (modem) was invented, allowing use of audio telephone lines for data communication.
Enjoy this video of a Circa 1964 Livermore Data Systems "Model A" 300 Baud Acoustic Coupler Modem, live demonstration.
Livermore Data Systems Inc. was a small firm from Livermore, California that made acoustic modems. Their products were a compatible replacement for the Bell 103 and 113 modems and were designed to be used with the usual serial interface on early terminals.
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