Multiplication checking apparatus

Claim 1

APPARATUS FOR CHECKING THE CORRECTNESS OF A MULTIPLICATION DEVICE FOR THE MULTIPLICATION TOGETHER OF A VARIABLE MULTIPLIER AND A VARIABLE MULTIPLICATED, WHEREIN MULTIPLICAND PULSES ARE GENERATED REPRESENTATIVE OF INCREMENTS OF A VARIABLE QUANTITY AND PRODUCT PULSES ARE GENERATED AT A RATE PROPORTIONAL, ACCORDING TO THE VALUES OF SAID MULTIPLIER, TO THE RATE OF GENERATION OF SAID MULTIPLICAND PULSES, SAID APPARATUS COMPRISING A MULTIPLICAND PULSE COUNTER, A PRODUCT, PULSE COUNTER, SWITCH MEANS SETTABLE ACCORDING TO THE VALUE OF SAID MULTIPLIER TO EXTRACT FROM SAID PRODUCT PULSE COUNT CORRESPONDING FOR THE VALUE OF SAID MULTIPLIER TO THE PRODUCT PERTAINING TO A SELECTED MAGNITUDE OF SAID VARIABLE QUANTITY, MEANS TO EXTRACT FROM SAID MULTIPLICAND COUNTER A SIGNAL UPON ATTAINMENT THEREBY OF A COUNT REPRESENTATIVE OF SAID SELECTED MAGNITUDE OF SAID VARIABLE QUANTITY, COINCIDENCE GATE CIRCUIT HAVING AT LEAST TWO INPUTS AND ONE OUTPUT, AND SEPARATE MEANS TO APPLY SAID SIGNALS TO SEPARATE ONES OF SAID INPUTS, AT LEAST ONE OF SAID LAST-NAMED MEANS PASSING A SIGNAL APPLIED THERETO FOR A LIMITED TIME ONLY.