1. A SIGNAL OPERATED CIRCUIT COMPRISING A POTENTIAL SOURCE; A PLURALITY OF STAGES, EACH OF SAID STAGES INCLUDING A FIRST WINDING FOR OPERATING FIRST CONTACTS AND A SECOND WINDING FOR OPERATING SECOND CONTACTS, THE SECOND WINDING HAVING FIRST AND SECOND COILS PROVIDING OPPOSITELY POLED FIELDS IN WHICH THE ENERGIZATION OF ONE COIL OPERATES THE SECOND CONTACTS AND THE ENERGIZATION OF BOTH OF THE COILS PREVENTS THE OPERATION OF THE SECOND CONTACTS, MEANS CONNECTING ONE TERMINAL OF THE FIRST WINDING AND ONE TERMINAL OF EACH OF THE COILS IN THE SECOND WINDING TO ONE SIDE OF THE POTENTIAL SOURCE, DIODE MEANS INTERCONNECTING THE OTHER TERMINALS OF THE FIRST AND SECOND COILS IN THE SECOND WINDING, A LATCH TERMINAL FOR THE STAGE CONNECTED TO THE OTHER TERMINAL OF THE SECOND COIL IN THE SECOND WINDING THROUGH THE FIRST CONTACTS, AND A SET TERMINAL CONNECTED TO THE OTHER TERMINAL OF THE FIRST COIL IN THE SECOND WINDING, THE OTHER TERMINAL IN THE FIRST WINDING, AND THE OTHER TERMINAL OF THE SECOND COIL IN THE SECOND WINDING THROUGH THE DIODE MEANS; AND CIRCUIT MEANS CONNECTING THE STAGES IN A SEQUENCE TO BE OPERATED BY TIME SPACED INPUT SIGNALS, SAID CIRCUIT MEANS INCLUDING A PLURALITY OF FIRST CIRCUITS EACH CONNECTED BETWEEN THE SET TERMINAL OF A STAGE AND THE POTENTIAL SOURCE AND INCLUDING THE SECOND CONTACTS OF THE ADJACENT STAGE IN THE SEQUENCE, EACH OF SAID FIRST CIRCUITS ENERGIZING BOTH OF THE COILS IN THE SECOND WINDING TO INHIBIT OPERATION OF THE SECOND CONTACTS IN THE STAGE AND ENERGIZING THE FIRST WINDING TO OPERATE THE FIRST CONTACTS IN THE STAGE, SAID CIRCUIT MEANS ALSO INCLUDING A PLURALITY OF SECOND CIRCUITS EACH CONNECTED BETWEEN THE LATCH TERMINAL OF A STAGE AND THE POTENTIAL SOURCE, EACH OF SAID SECOND CIRCUIT ENERGIZING THE SECOND COIL OF THE SECOND WINDING IN THE STAGE TO OPERATE THE SECOND CONTACTS IN THE STAGE AND PREPARE THE FIRST CIRCUIT FOR THE NEXT STAGE IN THE SEQUENCE.