1908 NO. 2 SHAFT-ROCKHOUSE SHOWING DROP HAMMER (LEFT) AND STEAM HAMMER (RIGHT) USED FOR CLEANING MASS AND BARREL COPPER Courtesy Library of Congress, Prints & Photographs Division, HAER, Reproduction number HAER MICH,31-HANC,1-280
This photograph is by carnkie and was uploaded January 22nd 2009. © carnkie please do not copy or distribute without prior express permission.
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