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EVENT-RESPONSIVE TELEPHONE SIGNAL DEVICE
US 3,538,257 A
Filed
: 10/31/1967
Issued
: 11/03/1970
Est. Priority Date
: 10/31/1967
Status: Expired due to Term
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Current Assignee
Cyril F. Bell
,
Robert D. Trammell Jr
,
Thomas G. Wright Jr
Original Assignee
Cyril F. Bell
,
Robert D. Trammell Jr
,
Thomas G. Wright Jr
Inventors
Wright, Thomas G. Jr.
,
Trammell, Robert D. Jr.
,
Bell, Cyril F.
Application Number
US04/679,324
Time in Patent Office
1,099 Days
Field of Search
US Class Current
379/69
CPC Class Codes
H04M 1/27
Devices whereby a plurality...
H04M 11/045
using recorded signals, e.g...
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