Wiktionary
wire recorder
n. (context historical English) A device for analogue audio storage made magnetically onto fine steel or stainless steel wire, introduced commercially after World War II primarily for office dictation.
WordNet
wire recorder
n. an early type of magnetic recorder using iron wire
Usage examples of "wire recorder".
Without speaking she got out the wire recorder and handed it to him.
With a mounting sense of excitement, he pressed the fourth button, and heard Faith Sawhill's voice emanating from the pen - which, as it happened, was also a miniature wire recorder.
Inside is an ultra-slow fine-wire recorder holding a spool that runs for a week.