Sequential testing system

Claim 1

IN A SYSTEM FOR TESTING A GROUP OF DEVICES, MEANS FOR STIMULATING SIMULTANEOUSLY SAID DEVICES AT PERIODIC INTERVALS TO PRODUCE OUTPUT PULSES FROM EACH OF THOSE OF SAID DEVICES WHICH FUNCTION PROPERLY, COUNTING MEANS HAVING AS MANY COUNT CONDITIONS AS THERE ARE SAID DEVICES, SAID COUNTING MEANS INCLUDING A PLURALITY OF OUTPUT LINES EACH CORRESPONDING TO ONE DISTINCT COUNT CONDITION AND ARRANGED IN THE SAME SEQUENCE AS SAID DEVICES, SAID COUNTING MEANS PROVIDING AN OUTPUT SIGNAL ONLY ON THAT ONE OF SAID OUTPUT LINES CORRESPONDING TO THE COUNT CONDITION THEN EXISTING, INDIVIDUAL GATING MEANS FOR EACH DEVICE, EACH GATING MEANS BEING ENABLED DURING THE PRESENCE OF AN OUTPUT SIGNAL FROM A CORRESPONDING ONE OF SAID OUTPUT LINES TO PERMIT TRANSFER OF AVAILABLE OUTPUT PULSES FROM THE CORRESPONDING BISTABLE DEVICE TO SAID COUNTING MEANS, SAID COUNTING MEANS BEING TRANSFERRED TO A SUCCEEDING COUNT CONDITION DURING SAID TRANSFER OF OUTPUT PULSES FOR PRODUCING AN OUTPUT SIGNAL ON THE SUCCEEDING OUTPUT LINE, A MULTIPLICITY OF VISUAL INDICATING ELEMENTS EACH RESPONSIVE TO A DIFFERENT ONE OF SAID OUTPUT SIGNALS FOR PROVIDING A SEQUENTIAL DISPLAY WHEN ALL OF SAID DEVICES ARE OPERATING IN THE DESIRED MANNER AND A STATIONARY INDICATION ONLY FROM THAT ONE OF SAID ELEMENTS ASSOCIATED WITH THE BISTABLE DEVICE FIRST DETERMINED TO BE OPERATING IMPROPERLY.