I've been doing some research into the predecessors of my electro-mechanical junk. Most of it has led me to the inventions of the typewriter, adding machines, calculating machines and analog computers. Much of that technology shares similar mechanisms, such as the keyboard which is present in the typewriter and also in adding machines.
I started to take apart the Paymaster X-900 cheque imprinter. The mechanism inside has some very complex movements. Here is a video showing the internals of the imprinter during operation:
Good news! I was able to procure an accordion today. It is on its way from Saskatchewan.
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