Seismic shooting sequence timer

Claim 1

IN SEISMIC EXPLORATION, A RADIO LINK CONTROLLED SHOOTING SEQUENCE TIMER COMPRISING ELECTRONIC CIRCUIT MEANS FOR RECEIVING AND LIMITING THE AMPLITUDE OF A CONTROL SIGNAL HAVING A PREDETERMINED MONFREQUENCE CHARACTERISTIC AND TIME DURATION, NARROW PASS FILTER MEANS FOR PASSING ONLY SAID PREDETERMINED CONTROL SIGNAL FREQUENCE, GATE MEANS FOR SETTING AN ELECTRONIC TRIGGER UPON PASSAGE OF AT LEAST A PREDETERMINED TIME PORTION OF SAID CONTROL SIGNAL, SAID TRIGGER BEING TRIPPED UPON TERMINATION OF SAID CONTROL SIGNAL, FIRST MONOSTABLE TIMING MEANS CONTROLLED BY SAID TRIGGER WHEN TRIPPED FOR INITATING A FIRST TIME DELAY PERIOD, ADDITIONAL MEANS CONTROLLED BY SAID FIRST TIMING MEANS FOR CLOSING A CIRCUIT TO SWITCH ON A TRANSMITTER PRIOR TO SHOOTING, SECOND MONOSTABLE TIMING MEANS CONTROLLED BY SAID FIRST MONOSTABLE TIMING MEANS AND ACTUATED SIMULTANEOUSLY THEREWITH TO INITIATE A SECOND TIME DELAY PERIOD, SAID SECOND TIME DELAY PERIOD BEING LESS THAN SAID FIRST TIME DELAY PERIOD, MEANS CONTROLLED BY SAID SECOND TIMING MEANS AT THE END OF SAID SECOND TIME DELAY PERIOD FOR ACTUATING A SHOOTING CIRCUIT TO DETONATE A SEISMIC CHARGE.