AUGUSTUS N. HAND, Circuit Judge.
This suit was brought for infringement of United States patents No. 1,567,863 and No. 1,567,864. Each relates to house wiring, and particularly to the mounting in outlet boxes of electric wiring devices such as switches and plug receptacles. The first patent, No. 1,567,863, has been called the "plaster ear patent," because the invention consists of an arrangement of plaster-engaging ears on the crossbar of the switch or plug receptacle...
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