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n4google.
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
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provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:49841527
rdf:type
prov:Entity
prov:value
A circuit for receiving ringing signals over a telephone line, the circuit comprisingsensing means responsive to valid ringing signals received over the lines and unresponsive to dialing pulses and transients received over the line, the sensing means including comparison means responsive to reception of a voltage reflective of the received signal being above or below a predetermined voltage level;
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n4:com
Subject Item
isap:474534112
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isa:49841527
Subject Item
isap:506185147
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isa:49841527