PER CURIAM:
This case involves U.S. Patent No. 3,797,680, a combination patent for a packing mechanism on rear loading refuse trucks that was issued to James Dennis and assigned to City Tank Corporation. City Tank appeals a judgment declaring the patent invalid and uninfringed by devices on Perfection-Cobey Company's Routemaster trucks. We affirm in part, vacate in part, and remand.
I
City Tank first contends that the district court failed to accord...
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