Patent
1978-06-28
1979-11-27
Cooper, William C.
H04M 322
Patent
active
041762568
ABSTRACT:
Circuit arrangement for time-dependent monitoring of the condition of lines with a scanning device operating with the so-called "last-look" method, which recognizes condition alterations on the line and which produces a message supplemented by the address which corresponds with the scanned line. The time-dependent evaluation is obtained by comparing an adjustable theoretical time placed in a memory with an actual time formed by a counter.
REFERENCES:
patent: 3800094 (1974-03-01), Schwarzer
patent: 3894191 (1975-07-01), Sassa
Fruth Albert
Harenberg Juergen
Cooper William C.
Siemens Aktiengesellschaft
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