HUNT, Circuit Judge (after stating the facts as above).
Machines for capping and compressing can heads and double-seaming without the use of solder were old in the art when Wilson and Sumner entered the field. Two steps mark the operation: First, that by which the flange on a cap is bent partly around the can and body flange so as initially to interlock the flanges; and, second, that by which the interlocked flanges are rolled or curled to complete the seam. This...
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