KIRKPATRICK, District Judge.
There are ten patents in suit, all relating to an auxiliary steam engine, commonly called a "booster," designed to furnish additional driving power, when required, to a steam locomotive. For convenience they may be divided into two groups. Four patents, constituting the first group, have to do principally with the means by which the engineer controls the operation of the booster, and may be called control patents. The remaining six patents...
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