SWAN, Circuit Judge (after stating the facts as above).
The appellant contends that, if claim 6 of the patent in suit is to be interpreted broadly enough to cover the device alleged to infringe, then the claim is invalid, in view of the prior art. Use of a single push button operated by foot pressure to set off a burglar alarm was old in the art, as illustrated in patent No. 848,016, to Donnenworth and patent No. 1,093,801 to Phelps; closing multiple circuits by depression...
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