An old instructional text records the pre-broadcast vocabulary of wireless telegraph and telephone systems. Useful for comparison across historical radio documents.
The purchase unlocks the identified historical reference and a bibliographic cross-check, not exclusive ownership of the underlying public resource. #Telegraphy #WirelessHistory
The purchase unlocks the identified historical reference and a bibliographic cross-check, not exclusive ownership of the underlying public resource. #Telegraphy #WirelessHistory
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