I've been largely obsessed with finding the patent for the toy, but so far it has been a fruitless investigation. On the back of the packaging there is 意匠登録 58-037528 which is a 'design registration' number.
The Japan Platform for Patent Information allows a search of the design number. Punching in the details, we return that in Showa 58 (1983), a design application was made with the Japan Patent Office (JPO).
I'm still hoping to track down the actual patent and schematics. The search continues...
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