Transistor switching circuits

Claim 1

AN ELECTRIC WRITING SYSTEM COMPRISING, IN COMBINATION: AT LEAST TWO WRITING STYLUS ELECTRODES; MEANS FOR GENERATING AND SUPPLYING TO SAID STYLUS ELECTRODES A PULSATING D.-C. POTENTIAL; A TRANSISTOR FOR EACH OF SAID STYLUS ELECTRODES EACH HAVING A RESPECTIVE INPUT AND OUTPUT CIRCUIT; TRANSFORMER MEANS FOR EACH OF SAID STYLUS ELECTRODES EACH HAVING A FIRST WINDING CONNECTED ACROSS THE RESPECTIVE OUTPUT CIRCUIT OF ONE OF SAID TRANSISTORS AND A SECOND WINDING, OF HIGHER INDUCTANCE THAN, AND INDUCTIVELY COUPLED TO, THE FIRST WINDING, CONNECTED TO SAID PULSE GENERATING MEANS IN PARALLEL WITH A RESPECTIVE ONE OF SAID STYLUS ELECTRODES; AN ADDITIONAL TRANSISTOR PRECEDING, IN CASCADE, A FIRST OF SAID OTHER TRANSISTORS; MEANS FOR APPLYING IN PARALLEL WITH THE OUTPUT OF SAID ADDITIONAL TRANSISTOR AND THE INPUT OF SAID FIRST TRANSISTOR A POTENTIAL NORMALLY EFFECTIVE TO RENDER SAID ONE FIRST TRANSISTOR CONDUCTIVE WHEN SAID ADDITIONAL TRANSISTOR IS NON-CONDUCTIVE; AND MEANS CONNECTING THE RESPECTIVE INPUTS OF SAID ADDITIONAL TRAN SISTOR AND A SECOND OF SAID OTHER TRANSISTORS IN PARALLEL.