DAWKINS, District Judge.
This is a suit for the alleged infringement of letters patent, Nos. 1,235,883 and 1,295,134, issued to Redus D. Dodds, August 17, 1917, and February 25, 1919, respectively, as well as No. 1,847,424, issued to Geo. J. Barrett and Sosthene Robichaux, March 1, 1932, of which plaintiffs are the owners or assignees. They cover devices for taking cores in the drilling of oil and gas wells to determine the presence of such minerals.
Defendants...
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