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I have to agree with Jim Watson, but am guessing. The use of non-ferrous metals that moved and contacted ferrous metals (not sure of the spelling on that) was a marketing pitch. When I was a kid, some companies still pushed it with traps they sold and other outdoor products. They claimed the triggers on the traps would not hang up due to corrosion or freezing because the triggers, being brass or bronze, would not freeze to steel. I don't remember if they were brass or bronze, as I was a kid and would not have known the difference anyway.
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