Title: Telephone loop extending apparatus

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Abstract: An electrical apparatus for use with telephone equipment to extend the effective length of an electrical circuit such as a subscriber loop or the like. The disclosed apparatus includes a variable resistance in shunt across the loop between the central office and a subscriber station, and also includes a sensor which senses the level of current in the loop and varies the shunt resistance in response thereto. When installed with the central office telephone switching equipment, the disclosed apparatus supplements the sensed current level in the loop, thereby increasing the distance from which subscriber station stations may be connected to the central office or enabling the use of telephone loops having greater internal resistance.


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