magnetic tape (which is plastic-based), wire recorders continued to be manufactured for this purpose through the 1950s and remained in use somewhat later than that. There were also wire recorders made to record data in satellites and other uncrewed spacecraft of the 1950s to perhaps the 1970s.

Characteristics

Magnetic format

Poulsen's original Telegraphone and other very early recorders placed the two poles of the record/replay head on

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