SOPER, Circuit Judge.
This appeal is taken from a declaratory judgment in which it was adjudged that United States Patent No. 2,492,870 for a stereoscopic projection map making instrument issued to Harry T. Kelsh and owned by Kelsh Instrument Company, Inc., a Maryland corporation, is valid and had been infringed by O. M. I. Corporation of America, a New York corporation, and Ottico Meccanica Italiana E Rivelamenti Aerofotogrammetrici S. p. A., an Italian corporation...
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