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I have no idea. But I'm very curious!
Already explained, a few posts above yours:
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On railroad mail cars they used mail pouches, and the pouches used some beefy locks. Throwing the unused locks into a plain wooden box would have damaged the wood so they used a metal lined box like this. This box full of locks would have been very, very heavy.
Don
Posted 05/25/2016 06:30 am
