Neutral to neutral or polar to polar solid state relay deriving all its power from the input signals

Claim 1

IN A TELEGRAPHY RECEIVING APPARATUS FOR ACTIVATING A POLAR OR NEUTRAL LOAD OF A DEVICE EXTERNAL TO THE APPARATUS, SAID LOAD BEING ACTIVATED IN RESPONSE TO RECEPTION OF DEGRADED POLAR OR NEUTRAL TELEGRAPHY PULSES, SAID APPARATUS REQUIRING NO ENERGIZING POTENTIAL EXTERNAL TO THE SUPPLIES OF THE EXTERNAL DEVICE, COMPRISING FIRST AND SECOND SIGNAL INPUT TERMINALS RESPONSIVE TO SAID PULSES, FIRST AND SECOND TRIGGERED OSCILLATORS HAVING POWER INPUT TERMINALS, MEANS FOR TRIGGERING SAID FIRST OSCILLATOR INTO OSCILLATION ONLY WHEN THE POTENTIAL OF SAID FIRST TERMINAL EXCEEDS THE POTENTIAL OF SAID SECOND TERMINAL, MEANS FOR TRIGGERING SAID SECOND OSCILATOR INTO OSCILLATION ONLY WHEN THE POTENTIAL OF SAID SECOND TERMINAL EXCEEDS THE POTENTIAL OF SAID FIRST TERMINAL, BOTH OF SAID TRIGGERING MEANS INCLUDING D.C. PATHS FOR APPLYING SAID PULSES TO THE POWER INPUT TERMINALS OF SAID OSCILLATORS, SAID PULSES BEING THE ONLY POWER SUPPLIED TO SAID POWER INPUT TERMINALS, FIRST AND SECOND PASSIVE RECTIFYING MEANS RESPECTIVELY RESPONSIVE TO THE OSCILLATIONS DERIVING FROM SAID FIRST AND SECOND OSCILLATORS, FIRST AND SECOND NORMALLY OPEN SWITCHING MEANS RESPONSIVE TO SAID FIRST AND SECOND RECTIFYING MEANS, RESPECITIVELY, EACH OF SAID SWITCHING MEANS BEING CLOSED IN RESPONSE TO THE D.C. VOLTAGE DERIVED FROM THE RECTIFYING MEANS TO WHICH IT IS RESPONSIVE, MEANS FOR CONNECTING A POWER SUPPLY OF ONE POLARITY MEANS, AND MEANS FOR ENABLING A POWER SUPPLY OF THE OTHER POLARITY TO BE CONNECTED IN SERIES CIRCUIT WITH SAID LOAD AND SAID SECOND SWITCHING MEANS, SAID POWER SUPPLIES BEING PART OF SAID EXTERNAL DEVICE.