SWAN, Circuit Judge.
It was conceded upon the argument that, if claims Nos. 3 and 4 are valid, they were infringed. But the defendant asserts the invalidity of said claims, postulating his contention upon the prior art and the doctrine of equivalency.
The art involved relates to laundry driers, which may be described generally as consisting of a drying cabinet, or chamber for the wet clothing, and a heating apparatus, usually located beneath the drying chamber...
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