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- Q7334841 subject Q7464721.
- Q7334841 subject Q8834661.
- Q7334841 abstract "In telephony, ringdown is a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp or cause the operation of a self-locking relay known as a drop.Ringdown is used in manual operation, as distinguished from automatic signaling by dialing a number. The signal consists of a continuous or pulsed alternating current (AC) signal transmitted over the line. It may be used with or without a telephone switchboard. The term originated in magneto telephone signaling in which cranking the magneto generator, either integrated into the telephone set or housed in a connected ringer box, would not only ring its bell but also cause a drop to fall down at the telephone exchange switchboard, marked with the number of the line to which the magneto telephone instrument was connected. The last ringdown telephone exchange in the United States was located at Bryant Pond, Maine, had 400+ subscribers, and converted to dial service in October 1983.".
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- Q7334841 wikiPageWikiLink Q7464721.
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- Q7334841 wikiPageWikiLink Q8834661.
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- Q7334841 type Thing.
- Q7334841 comment "In telephony, ringdown is a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp or cause the operation of a self-locking relay known as a drop.Ringdown is used in manual operation, as distinguished from automatic signaling by dialing a number. The signal consists of a continuous or pulsed alternating current (AC) signal transmitted over the line. It may be used with or without a telephone switchboard.".
- Q7334841 label "Ringdown".
- Q7334841 differentFrom Q7447757.
- Q7334841 depiction Jimmy_Carter_Library_and_Museum_99.JPG.