Metropolitan Device Corp. v. Williamsburg Electric Supply Co.

MANTON, Circuit Judge.

This suit is' upon four patents, all owned by the appellee, and all used in meter service entrance switch boxes sold by it. There are several other patented features of the appellee’s commercial box, with which we are not here concerned. The appellant makes a switch box which is claimed to infringe the four patents in suit. The known type of installation before the ap-pellee’s was a bloek carrying the required fuses and cut-out devices, mounted on a wall or similar support, and covered by a box with its lower end open and the meter casing set close up against the end of…