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Secret Communication System Patent Print - Chalkboard Patent Title: Secret Communication System Inventor Name: Markey Hedy Kiesler;...read more
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Secret Communication System Patent Print - Chalkboard Patent Title: Secret Communication System Inventor Name: Markey Hedy Kiesler; Antheil George Year Issued: August 11 1942 Item Number: 11467 Reprint of original Patent Patent is printed ...