YANKWICH, District Judge.
The plaintiff is the owner of a patent on a well-casing protector and also of a patent on an improved well-casing protector which he licensed to C. L. Patterson and J. C. Ballagh to manufacture and sell. Their interest was assigned to the corporation defendant. The well-casing protectors consist of heavy rubber rings of an interior diameter smaller than the drill pipe on which they are to be placed and used. They are of such size and thickness...
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