Title:
Secret-message-transmitting system
United States Patent 1657366
Inventors:
Edouard, Belin
Publication Date:
01/24/1928
Export Citation:
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Assignee:
Edouard, Belin
Primary Class:
380/244
Other Classes:
358/415, 380/26
International Classes:
H04N1/44; H04N1/44
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