Title:
System and apparatus for secret radio communication
United States Patent 1838762


Inventors:
Hammond Jr., John Hays
Application Number:
US26236528A
Publication Date:
12/29/1931
Filing Date:
03/17/1928
Assignee:
Hammond Jr., John Hays
Primary Class:
Other Classes:
380/34
International Classes:
H04K1/00
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