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Combined telephone-telegraphy system wherein local calling box includes telephone equipment and telegraphy transmitter
US 3,384,714 A
Filed
: 10/12/1964
Issued
: 05/21/1968
Est. Priority Date
: 10/12/1964
Status: Expired due to Term
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Current Assignee
RB Allen Company Incorporated
Original Assignee
Foster E. Weld
,
Robert B. Mclcod
,
Robert W. Lassell
Inventors
Weld, Foster E.
,
Lassell, Robert W.
,
Mclcod, Robert B.
Application Number
US04/403,316
Time in Patent Office
1,317 Days
Field of Search
US Class Current
370/214
CPC Class Codes
H04M 11/04
with alarm systems, e.g. fi...
H04M 11/06
Simultaneous speech and dat...
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