CHASE, Circuit Judge.
The patent in suit is for a dumping mechanism for semitrailers. It was allowed with four claims but only those numbered 2 and 3 are now in issue. They read as follows:
"2. In combination with a tractor and semi-trailer, dumping mechanism mounted wholly on the tractor, a fifth wheel connection between the tractor and semi-trailer, one element of which is carried on the tractor and connected with the dumping mechanism and the co-operating...
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