A patent on make a Portable Tape Player thinner. https://patents.google.com/patent/US5029033A/en?oq=US4649453A [ATTACH]
An early Toshiba Portable Cassette Player Patent https://patents.google.com/patent/US4593331A/en?oq=US4649453A [ATTACH]
The original Sony Walkman Patent? Probably not it looks like the first revision. https://patents.google.com/patent/US4453189A/en?oq=US4649453A...
Sony Sports Model Walkman Patent! https://patents.google.com/patent/US4649453A/en?oq=US4649453A [ATTACH]
A very early Panasonic Patent, check out the name "Jazz" and the button placement. https://patents.google.com/patent/US4580181A/en?oq=US5414573A...
Another Sony.... Cassette accommodating type electronic device having a plurality of windows for identifying the amount of remaining tape and the...
Panasonic's Patent for a smaller Magnetic tape recording and/or reproducing apparatus from 1977....
Here's a cool one, Sony's Direct Drive Patent https://patents.google.com/patent/US4630149A/en?oq=US4630149A [ATTACH]
The first portable CD player? Not in 1999... https://patents.google.com/patent/US6041023A/en?oq=us6041023 [ATTACH]
Stereo sunglasses! https://patents.google.com/patent/US5164987A/en?oq=US5164987 [ATTACH]
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