YANKWICH, District Judge.
Letters Patent No. 1,871,825, issued on August 16, 1932, to Nelson K. Smith, "for an elevator latch" deal with an invention which, as the specifications declare, "relates to side door elevators of the type used in the raising and lowering of well casing, tubing, and the like, in the operations of drilling a well and maintaining the same in production." One of the declared objects of the invention "is to provide a latch that operates in a...
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