Bistable multivibrator which changes states in response to a single limited range, variable input signal

Claim 1

A MULTIVIBRATOR CIRCUIT HAVING TWO STABLE STATES, COMPRISING: A PAIR OF MAIN AMPLIFYING DEVICES, A CONTROL AMPLIFYING DEVICE ASSOCIATED WITH EACH OF SAID MAIN AMPLIFYING DEVICES, EACH OF SAID AMPLIFYING DEVICES HAVING FIRST AND SECOND ELECTRODES PROVIDING A CONTROLLED CIRCUIT AND HAVING A CONTROL ELECTRODE FOR SAID CONTROLLED CIRCUIT, CIRCUIT MEANS CONNECTING ELECTRODES OF SAID DEVICES AND A VOLTAGE SOURCE TO PROVIDE ONE SAID STABLE STATE IN WHICH THE CONTROLLED CIRCUIT OF ONE MAIN DEVICE IS IN CONDUCTING CONDITION AND THE CONTROLLED CIRCUIT OF THE OTHER MAIN DEVICE IS IN NON-CONDUCTING CONDITION AND A SECOND SAID STABLE STATE IN WHICH THE CONDUCTING CONDITIONS OF SAID CONTROLLED CIRCUITS ARE REVERSED, SAID CIRCUIT MEANS INCLUDING, MEANS FOR SUPPLYING CONTROL VOLTAGES TO THE CONTROL ELECTRODES OF SAID CONTROL DEVICES INCLUDING MEANS FOR APPLYING A VARYING CONTROL VOLTAGE FROM A SOURCE EXTERNAL OF SAID MULTIVIBRATOR CIRCUIT TO THE CONTROL ELECTRODE OF ONE OF SAID CONTROL DEVICES, CONNECTION MEANS FOR THE ELECTRODES OF SAID CONTROL DEVICES FOR PRODUCING BY AMPLIFIER ACTION OF BOTH SAID CONTROL DEVICES AN AMPLIFIED VOLTAGE ON THE FIRST ELECTRODE OF ONE CONTROL DEVICE WHICH DECREASES AS THE CONTROL VOLTAGE ON THE CONTROL ELECTRODE OF SAID ONE CONTROL DEVICE INCREASES AND WHICH INCREASES AS THE VOLTAGE ON THE CONTROL ELECTRODE OF THE OTHER CONTROL DEVICE INCREASES AND VICE VERSA, AND MEANS CONNECTING THE FIRST ELECTRODE OF EACH OF SAID CONTROL DEVICES TO THE CONTROL ELECTRODE OF ITS ASSOCIATED MAIN DEVICE FOR SUPPLYING SAID AMPLIFIED VOLTAGES TO THE CONTROL ELECTRODES OF SAID MAIN DEVICES TO CONTROL THE CHANGING OF SAID MULTIVIBRATOR FROM ONE STABLE STATE TO THE OTHER.