JOHN R. BROWN, Circuit Judge:
A. B. Baumstimler, the holder of two letters patent on oil well clean-out tools, sued Kenneth Laughlin, Beuford Rankin, and John Barbee for infringement and, after a jury trial on liability, received a judgment against all defendants. Defendant Laughlin appeals, alleging a multitude of errors, including incorrect instructions to the jury, insufficient evidence of infringement, improper submission of the issue of validity to the jury,...
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