BRIGHT, Circuit Judge.
Glen R. Hadfield, the patentee and owner of United States Letters Patent No. 3,387,666 [hereinafter '666 Patent], brought this suit for patent infringement against the Ryan Equipment Co., a manufacturer of sod harvesting equipment. The district court, Judge Nordbye, in an unreported opinion, held the '666 Patent invalid for obviousness, and therefore, did not reach the issue of infringement.
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