SOPER, Circuit Judge.
Four United States patents which belong to The Visking Corporation and relate to artificial sausage casings are in controversy in this suit, which was instituted April 6, 1939. They are the Freund patent No. 1,959,978, issued May 22, 1934 on an application filed January 12, 1931, which relates to the preprinting of a name or mark on the casings before they undergo the packing process; the DeCressey patent No. 1,890,215, issued December 6, 1932...
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