
Reminds me of the Sony Elcaset. I used to sell them, but not many. http://en.wikipedia.org/wiki/Elcaset
They were not portable, one of the main strengths of the casette. They also took the idea of "holes" to identify tape and prevent accidental erasure to a new level. Those things must have had a dozen tabs to set off sensors in the tape deck to tell it everything but hte tapes moms maiden name.