RICH, Circuit Judge.
American Hoist and Derrick Co. (AmHoist) appeals from the unpublished decision of the United States District Court for the District of Oregon holding for Sowa & Sons, Inc. (Sowa) on AmHoist's suit for infringement of claims 3, 5, and 7 of its Shahan U.S. Patent No. 4,079,584, issued March 21, 1978, for a "Heavy Duty Shackle." After a two and one-half day jury trial, the jury rendered a verdict for defendant by answering written interrogatories...
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