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Evolution history of sand making machine models-

Sep 19, 2020 26 The evolution as exemplified by the history of Springfield Armory has been in the shift from hand work to machine work: hand forging or blacksmithing has given way to machine forging; hand filing to machine cutters. A wax or plastic model of the part is made in molds like these or can be machined or carved from a solid block. These

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