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The practice is even older than that. Otis when demoing his elevator cut the only rope holding up the elevator platform, as far back as the mid-1800s.
by _asummers 8y ago
The practice is even older than that. Otis when demoing his elevator cut the only rope holding up the elevator platform, as far back as the mid-1800s.
- bradknowles 8y agoThe practice goes back to the 1600s, at least. Google for “proof mark” relative to breast plate armor.