MANSFIELD, Circuit Judge:
The issue before us on this appeal is the validity of United States Letters Patent No. 3,390,893, issued on July 2, 1968, to plaintiff-appellee Owen Finlay Maclaren with respect to a "collapsible support assembly," suggested as useful for structures such as baby carriages, folding chairs, shopping carts, and the like. Maclaren subsequently licensed the patent to co-plaintiff-appellee Miron Charles Bell for manufacture in the United States...
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