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The principle of magnetic recording was first developed in 1893 by a Danish inventor, Valdemar Poulsen
Cassettes ARE magnetic recording tape.
You can record these onto a computer and then burn them to CD, or use a standalone CD recorder to transfer the recording.
Finn Jorgensen has written:
'The complete handbook of magnetic recording' -- subject(s): Magnetic recorders and recording
Valdermar Poulsen