CUMMINGS, Circuit Judge.
This patent infringement action concerns three frequency modulation (FM) patents owned by the late Major Edwin Armstrong. The plaintiff is his widow and executrix.
The three patents involved are No. 1,941,069 ('069) covering the wideband FM system, No. 1,941,066 ('066) covering the synchronous heterodyne method for FM reception, and reissue patent No. 21,660 ('660) covering a preemphasis and deemphasis system for use in FM. The '069...
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