SANBORN, Circuit Judge.
This appeal is from a decree in favor of the plaintiffs (appellees) in a suit brought for the alleged infringement of letters patent No. 1,658,323 to Lloyd Blackmore and letters patent No. 1,819,979 to Otto M. Summers, both of which relate to temperature control for electric refrigerators. The defenses are noninfringement and invalidity of the patents in suit. The patents belong to the Frigidaire Corporation, and the Penn Electric Switch Company...
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