BURKE, District Judge.
This suit is for the infringement of three patents; Mason reissue No. 20,092; Bristol reissue No. 19,944 and Bristol No. 1,624,887, all owned by the plaintiff. The Mason patent covers a mechanism for automatic control of industrial processes involving temperature, humidity, flow, pressure, liquid level, chemical concentration and the like. Prior to Mason's invention there was no controller capable of automatically controlling difficult multi...
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