EVANS, Circuit Judge.
On this appeal the validity and infringement of a reissue patent to plaintiff are in issue. A "temperature control system" is the subject of the patent. Plaintiff asserts that it is to be found in use in radio broadcasting stations, of which there are about seven hundred and forty in the United States.
To use the patentee's own language, it relates more particularly to "a construction of a cabinet in which the temperature is kept substantially...
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