Sansui and it's founder KÅsaku Kikuchi. Apparently women were great at putting together circuit boards.
It was noted that the building's exterior was made similar to their speaker grills https://audio-database.com/SANSUI/speaker/sp-2005-e.html
For my short time in the audio industry I had to build jigs similar to this (from the photos above). I'm not sure what this one is for. I had a mini-mill and used a ton of aluminum with hex-head screws instead of polycarbonate (the clear plastic). One of mine was pretty intricate like this where I had rolls of tiny black stickers that had to be stuck on the sides of the cassette case towards the bottom. Some tape decks used a light to sense the clear leader and this would trigger the end of tape stop. Our cleaning tapes had mesh media that would allow light to go through so we had to put on the black stickers to allow you to do your cleaning without the tape deck shutting down.
