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The GRA-71 is a device that allows the user to record a message composed of dits and dahs onto a small tape cartridge, then the message is 'played back' at a rate of about 300 WPM, to electrically key the transmitter.
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The GRA-71 is a device that allows the user to record a message composed of dits and dahs onto a small tape cartridge, then the message is 'played back' at a rate of about 300 WPM, to electrically key the transmitter.
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