Multi-level printed cards for electronic switching equipment

Claim 1

A MULTI-LEVEL PRINTED CARD COMPRISING A MAIN CARD AND A MATRIX CARD, THESE TWO CARDS BEING PARALLEL THEREBETWEEN, A FIRST SET OF INPUT TERMINALS ALIGNED ON THE FRONT FACE OF THE MAIN CARD ADJACENT TO A SIDE THEREOF, A SECOND SET OF OUTPUT TERMINALS ALIGNED ON THE BACK FACE OF THE MAIN CARD ADJACENT TO SAID SIDE, A FIRST PLURALITY OF PINS EXTENDING FROM THE FRONT FACE OF THE MAIN CARD PERPENDICULARLY THERETO AND DISPOSED AT THE TOP OF THE FRONT FACE OF THE MAIN CARD FORMING A JUNCTION FOR A GRADING NETWEOK, PASSING THROUGH APERTURES IN THE MATRIX CARD AND PROJECTING THE BACK FACE OF SAID MATRIX CARD, A SECOND PLURALITY OF PINS EXTENDING FROM THE BACK FACE OF THE MAIN CARD PERPENDICULARLY THERETO DOWN TO THE FRONT FACE OF THE MATRIX CARD AND DISPOSED IN AN ALIGNMENT ALONG THE SIDE THEREOF OPPOSITE TO THE SIDE BEARING THE TERMINAL SETS, A THIRD PLURALITY OF PINS PROJECTING FROM THE FRONT FACE OF THE MATRIX CARD PERPENDICULARLY THERETO AND RESPECTIVELY PARALLEL ADJACENT TO THE PINS OF THE FIRST PLURALITY, A FIRST SET OF CONDUCTORS PRINTED ON THE FRONT FACE OF THE MAIN CARD BETWEEN THE INPUT TERMINALS AND THE ENDS OF THE PINS OF THE FIRST PLURALITY, A SECOND SET OF CONDUCTORS PRINTED ON THE FRONT FACE OF THE MATRIX CARD BETWEEN THE ENDS OF THE PINS OF THE THIRD PLURALITY AND THE ENDS OF THE PINS OF THE SECOND PLURALITY, A THIRD SET OF CONDUCTORS PRINTED ON THE BACK FACE OF THE MAIN CARD BETWEEN THE ENDS OF THE PINS OF THE SECOND PLURALITY AND SAID OUTPUT TERMINALS, A SET OF BRIDGE CONDUCTORS CONNECTED TO THE PROJECTING ENDS OF THE ASSOCIATED PINS IN THE FIRST AND THIRD PLURALITIES AND CURRENT DETECTORS INSERTED IN SAID BRIDGE CONDUCTORS.