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4-track cartridge
The 4-track cartridge or Stereo-pak is an audio storage magnetic tape cartridge technology, inspired by the Fidelipac 3-track tape cartridge system invented by George Eash in 1954 and used by radio broadcasters for commercials and jingles - since 1959, then adapted by Earl "Madman" Muntz in 1962, for use in cars as an alternative to radio.
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