Coin telephone monitor circuit
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United States of America Patent
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-
Apr 20, 1982
Grant Date -
N/A
app pub date -
Jun 2, 1980
filing date -
Jun 2, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit which monitors a coin telephone for coin ground, coin collect, coin return, stuck coin and ground fault conditions. Hall effect devices are used to detect the status of these conditions and to provide isolation between the coin telephone line and the coin telephone monitor circuit.
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