RICH, Circuit Judge.
This appeal is from the September 8, 1983, judgment of the United States District Court for the Southern District of Texas, sitting without a jury, holding that U.S. patent No. 4,003,440 ('440) issued January 18, 1977, on the invention of Martin D. Cherrington (Cherrington) and subsequently assigned to appellant Reading & Bates Construction Company for "Apparatus and Process for Drilling Underground Arcuate Paths Utilizing Directional Drill...
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