WHITAKER, Judge.
Plaintiffs sue the United States for $15,000 as damages for the infringement of what is known as the Brockstedt patent. They allege that shortly after May 31, 1938, the International Telephone Development Company, Inc., constructed for the defendant "an instrument landing system for aircraft," which included the installation of "four runway localizer beacons * * * which included the use of the double modulation type of equisignal beacon forming the...
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