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rock crushers invented

rock crushers invented

History tells us, it was in 1830, the first US patent was issued on arock crushingmachine. It covered a device which, in a crude way, incorporated the drop hammer principle later used in the famous stamp mill, whose history is so intimately linked with that of the golden age of mining. In 1840, another patent was issued, which comprised a wooden box containing a cylindrical drum apparently ...

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