OPINION
CAFFREY, Chief Judge.
This is a civil action brought pursuant to 35 U.S.C.A. § 281 for alleged infringement of United States Patent No. 3,583,888. Jurisdiction is based on 28 U.S.C.A. § 1338(a) and 28 U.S.C.A. § 1400(b). Plaintiff Shanklin Corporation and defendant Springfield Photo Mount Company are Massachusetts corporations.
The patent in suit was issued on June 8, 1971, on the basis of an application filed on April 10,...
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