KNOX, District Judge.
Defendant has put upon the market and sold a superheterodyne radio receiving set, which plaintiffs claim to be an infringement of Fessenden patents, Nos. 1,050,441 and 1,050,728, and of the Armstrong patent, No. 1,113,149. Each of these patents has been adjudicated and sustained. They are now owned or controlled by plaintiffs.
The two Fessenden patents relate to heterodyning; one being for the method, and the other for the apparatus....
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