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Secret radiant telephony
US 1,596,251 A
Filed
: 12/02/1922
Issued
: 08/17/1926
Est. Priority Date
: 12/02/1922
Status: Expired due to Term
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Current Assignee
Hammond Jr John Hays
Original Assignee
Hammond Jr John Hays
Inventors
HAMMOND JR JOHN HAYS
Application Number
US02/604,623
Time in Patent Office
1,354 Days
Field of Search
US Class Current
380/34
CPC Class Codes
H04K 1/02
by adding a second signal t...
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