ANDERSON, Circuit Judge.
Appellees sued appellants for infringement of claims 1, 2, and 7 of patent No. 1,590,921, granted to Theodore H. Wittliff June 29, 1926. The District Court held the claims valid and infringed.
The patentee says that his invention relates to a fastening device "which may be readily applied to the corners of framed structures to hold the elements thereof rigidly together," and "is also especially adapted for application to chairs, beds...
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