(Now the only reason you need to submit a model is if you claim a perpetual motion machine, in other words they don't believe you.)
It's amazing that patents are numbered in only the single-digit millions.
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Also, the PTO used to require (until late 1800s?) a working or mini-model to prove your invention was useful. I think the model collection was sold in the 20s.
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The modern numbering only started in 1836 (there's a different numbering system from 1790 until then, but I think it only has 10,000 or so)
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Especially the careless way the PTO hands them out for obviously indefensible stuff.
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