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  1. I run a Gold Rush museum and have a pretty good handle on milling machinery but I have compiled a long list of questions that I can find no information on. I'll throw this one out: There was a stamp mill called a thunder crusher that was made in or sold out of New York and used in the 1860's in California. Apparently it was a superior performer to Hendy and many other mills made on the west coast and was said to be " guaranteed to save all the gold in the rock and some that ain't" . Is anyone familiar with this model or type of stamp mill? Millman