The man behind Learjet was also the inventor of this early tape format that carried 4 pairs of stereo tracks
[DOC] [TLE] 8-track tape - Wikipedia [PAR] The original format for magnetic tape sound reproduction was the reel-to-reel 
tape recorder, first available in the US in the late 1940s, but too expensive and... [DOC] [TLE] Stereo-Pak - Wikipedia [PAR] The Muntz Stereo-Pak, commonly known as the 4-track cartridge, is a magnetic 
tape sound ...