Supply bridge can be subjected to considerable overloads the form of two identical resistors 1 and 1 applied simultaneously by serigraphie of a layer of certain enzymes thick on a same insulating support 10, the thickness was determined in order to keep said overloads, the adjustment of the resistors being effected by isolation of a part of the layer of certain enzymes in its entire length. / p & & p & application telephony to the bridges of the power supply lines of subscribers.
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