1878 – Toy Mechanical Horse – Andrew J. Davis (American)
Patent number: 209468 Filing date: Jul 26, 1878 Issue date: Oct 29, 1878 see pdf here. Although a patent for a toy, the walking mechanism is what's important here. On the whole, I have found that toys, particularly those that actually made it into production, show proof of concept in most cases, and that future …
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