WILSON, Circuit Judge.
This is an appeal from the District Court of Massachusetts holding invalid a patent, No. 1,970,376, granted to Walter J. Hamburger on August 14, 1934, and dismissing the complaint against the defendant-appellee for infringement, although the District Court found that, if valid, the defendant had infringed the patent.
The patent involved a process for making tennis strings of silk, with what is termed a "perfect spiral"; that is, with...
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