Look in googlebooks for The American Machinist July 10, 1913, pages in the forties, for a full description of the building of Parker barrels, including pictures of the machines used in the various operations. In my research files, I have descriptions and inventories of these machines, but I have never seen pictures. The article describes the "one line at a time" procedure and also the procedure used to skip the cutter over the rib inscription and the end of the rib. Unbelievable.
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