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Patent US2406349 - SECRET SIGNALING
SECRET SIGNALING
Frederick G. Buhrendorf
› Overview
Abstract
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Description
Claims
Patent number
: 2406349
Filing date
: Jul 10, 1942
Issue date
: Aug 27, 1946
Inventor
:
Frederick G. Buhrendorf
Original Assignee
:
Bell Telephone Laboratories
Current U.S. Classification
:
380/36
;
380/22
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