HAMLEY, Circuit Judge.
These two cases involve the validity, infringement and misuse of patents covering devices for skimming and filtering the water in swimming pools and vacuuming the sides and bottom of said pools. The letters patent in question are No. 2,826,307, granted to Robert M. Pace (Pace patent) and No. 2,844,255, granted to David K. Cavenah and Paul J. Steffan (Cavenah patent), both of which have been assigned to Landon, Inc. (Landon).
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