BYRNE, District Judge.
On March 26, 1965, Solenoid Devices Inc. filed in this court a complaint for declaratory judgment of patent invalidity against Ledex Inc. Plaintiff alleged that since the summer of 1963, it has been designing, manufacturing and selling certain electro-mechanical devices, among which is a certain rotary solenoid; that on September 15, 1964, a U. S. patent was issued to defendant (as assignee of the applicant) for a "solenoid operated rotary actuator...
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