Circuit arrangement for marking the points of intersection of a resistancediode matrix

Claim 1

A MATRIX COMPRISING COORDINATE SETS OF LINES, FIRST SWITCH MEANS CONNECTED TO EACH OF SAID LINES FOR APPLYING A MARKING VOLTAGE TO THAT LINE, A DIODE AND RESISTOR SERIALLY CONNECTED BETWEEN EACH LINE OF ONE SET AND EACH LINE OF THE OTHER SET AT THEIR INTERSECTION, A SOURCE OF VOLTAGE DIFFERENT FROM SAID MARKING VOLTAGE, A SEPARATE VOLTAGE DEVELOPING IMPEDANCE, WITH AT LEAST TWO TERMINALS, ASSOCIATED WITH EACH LINE OF ONE OF SAID SETS OF LINE ONE OF SAID TERMINALS CONNECTED TO THE ASSOCIATED LINE AND THE OTHER OF SAID TERMINALS CONNECTED TO SAID SOURCE OF DIFFERENT, VOLTAGE, TO THEREBY COMPLETE A SERIES CIRCUIT INCLUDING SAID IMPEDANCE, SAID ASSOCIATED LINE AND SAID SOURCE OF DIFFERENT VOLTAGE, A SEPARATE ACTIVATABLE SHUNT CONNECTED IN PARALLEL WITH EACH SAID VOLTAGE DEVELOPING IMPEDANCE, AND SECOND SWITCH MEANS FOR JOINTLY ACTIVATING EACH ACTIVATABLE SHUNT WHILE DISABLING THE CORRESPONDING FIRST SWITCH MEANS, WHEREBY THE VOLTAGE DEVELOPED ACROSS SAID VOLTAGE DEVELOPING IMPEDANCE MAY BE REDUCED.