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Vaule Of Old Ore Crushing Balls Stone Crusher Flanges

Vaule Of Old Ore Crushing Balls Stone Crusher Flanges

Apr 16 2015 History tells us it was in 1830 the first US patent was issued on a rock crushing machine.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

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