Watchman's clock system
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United States of America Patent
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-
Feb 13, 1996
Grant Date -
N/A
app pub date -
Dec 14, 1994
filing date -
Apr 23, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A watchman's clock system comprises a time clock unit capable of interrogating and receiving a coded response from a passive radio frequency responder, typically an identification coded radio frequency tag, located at a site to be visited.
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