PATTERSON, Circuit Judge.
The Philad Company, owner of a patent on a process for imparting a permanent wave to the hair, patent to Mayer, reissue 18,841, brought suits for infringement against four concerns. The charge was that the defendants were guilty of contributory infringement, in that they sold appliances designed for use in waving hair by the patented process, with knowledge that purchasers were to use the appliances in waving hair by that process. The cases...
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