Switch control systems

Claim 1

APPARATUS INCLUDING: A SUPPORT ADAPTED FOR PASSAGE THROUGH A WELL BORE FOR POSITIONING AT VARIOUS LEVELS IN A WELL BORE BY MEANS OF AN ELECTRICAL CABLE HAING CABLE CONDUCTORS; A PLURALITY EXPLOSIVE MEANS DISPOSED IN SAID SUPPORT, AND ELECTRICAL FIRING MEANS FOR EACH SAID EXPLOSIVE MEANS SO THAT SUCH EXPLOSIVE MEANS MAY BE INDIVIDUALLY DETONATED AT VARIOUS LEVELS IN A WELL BORE; AN ELECTRICAL DISTRIBUTION CIRCUIT IN SAID SUPPORT INCLUDING FIRST STEPPING SWITCH MEANS PROVIDING SEQUENTIAL ELECTRICAL CONNECTION OF A FIRST CABLE CONDUCTOR TO EACH OF SAID ELECTRICAL FIRING MEANS, AND MEANS FOR SELECTIVELY SUPPLYING FIRING CURRENT VIA THE FIRST CABLE CONDUCTOR TO SAID FIRST STEPPING SWITCH; MANS SYNCHRONIZED TO THE MOVEMENT OF SAID FIRST STEPPING SWITCH FOR PROVIDING AN ELECTRICAL INDICATION SIGNAL OF THE PARTICULAR ELECTRICAL CONNECTION OF SAID FIRST STEPPING SWITCH, SAID SIGNAL INDICATION MEANS INCLUDING TWO CHARACTERISTICALLY DIFFERENT IMPEDANCE MEANS FOR ALTERNATELY PROVIDING ONLY TWO INDICATION SIGNALS, SURFACE LOCATED, FIRST INDICATING MEANS COUPLED VIA A SECOND CONDUCTOR IN THE ELECTRICAL CABLE TO SAID SIGNAL INDICATION MEANS FOR INDICATING THE PARTICULAR ELECTRICAL CONNECTION OF SAID FIRST STEPPING SWITCH; SURFACE LOCATED MEANS INCLUDING A SECOND STEPPING SWITCH MEANS PROVIDING SEQUENTIAL ELECTRICAL CONNECTIONS IDENTICAL TO SAID SEQUENTIAL CONNECTIONS OF SAID FIRST STEPPING SWITCH AND INCLUDING MEANS FOR PROVIDING AN ELECTRICAL INDICATION SIGNAL OF THE PARTICULAR ELECTRICAL CONNECTION OF SAID SECOND STEPPING SWITCH, AND SECOND INDICATING MEANS COUPLED TO SAID SECOND STEPPING SWITCH FOR INDICATING THE PARTICULAR ELECTRICAL CONNECTION OF SAID SECOND STEPPING SWITCH; SURFACE LOCATED MEANS COUPLED TO SAID FIRST AND SECOND SWITCHES FOR STEPPING SAID SWITCHES SIMULTANEOUSLY.