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Telescopic graph contact with double current operation with, in the state of rest, no current flows through the line and with, in the inoperative state, under switching off of the transmitter batteries is firmly connected to the line lines relay
Telescopic graph contact with double current operation with, in the state of rest, no current flows through the line and with, in the inoperative state, under switching off of the transmitter batteries is firmly connected to the line lines relay
