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MONITORING AND CONTROL SYSTEM
US 3,435,416 A
Filed
: 10/29/1964
Issued
: 03/25/1969
Est. Priority Date
: 10/29/1964
Status: Expired due to Term
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8 Citations
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Current Assignee
Edward F. Lyons
,
Kenneth P. Kretsch
Original Assignee
Edward F. Lyons
,
Kenneth P. Kretsch
Inventors
Kretsch, Kenneth P.
,
Lyons, Edward F.
Application Number
US04/407,340
Time in Patent Office
1,608 Days
Field of Search
US Class Current
340/3.51
CPC Class Codes
H04Q 1/26
for signalling trouble in u...
H04Q 9/14
Calling by using pulses
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