US2292387A - Secret communication system - Google …
H. K. MARKEY ETAL, 4 2,292,387 . SECRET COMMUNICATION SYSTEM Filed June 10, 1941 2 Sheets-Sheet 2 Patented Aug. 111, 1942 SECRET COMlVIUNICATION SYSTEM Hedy Kiesler Markey, Los Angeles, and George Anthcil, Manhattan Beach, Calif.