RIVES, Circuit Judge.
This is a suit for infringement of U. S. Patent No. 2,087,983, issued July 27, 1937 to J. Woodward Martin, and covering a device described as a "Draft Equalizer for Gas Burners." The district court held the patent valid and infringed and enjoined appellant from the further manufacture and sale of its "Saf-Aire" gas heater.
The evidence involves the gas-burner art, and particularly the problem of taking from out-of-doors the fresh air...
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