SWAN, Circuit Judge.
The three patents in suit relate to lubricating apparatus which has come into very extensive use in the greasing of machine bearings, particularly those of automobiles. Speaking broadly, the apparatus consists of a compressor or "grease gun" adapted to force grease through a flexible hose attached thereto, a coupling device at the end of such hose, and a grease cup or fitting, adapted to be permanently located in proximity to a bearing, to which...
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