DENISON, Circuit Judge.
The plaintiff below, appellant here, is a long-established manufacturer of stoves. Prior to 1921, it and many other manufacturers had made heaters consisting of what was essentially a stove surrounded with a casing and providing an intervening air jacket. Air was taken in near the floor, passed upward as it was heated, and discharged through gratings at the top, thus providing a circulatory heating system for a room. Also prior to 1921, the...
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