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Title: An Electronic Point Marking System
Author: Stephen G. Chandler
Source: American Gas Association 1978
Year Published: 1978
Abstract: An electronic marking system (EMS) can be used to simplify location of points of interest on a distribution system. The EMS consists of an electronic marker which must be buried over the facility of interest. At a later date, a locator is used to pinpoint the buried marker. The locator is a transceiver that sends out a signal and then listens for the reflection from the marker. Marker and locator must operate on the same frequency. Other buried utilities, AC power and nearby metallic objects will not interfere with the locating process.

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