Seismic reflection fabrics of continental collision and post-orogenic extension in the Middle Urals

A time lock-out system including an operator circuit having a normally open lock-out switch therein. A control circuit is provided which includes a holding switch that is responsive to the absence of an electrical signal to assume a first position and responsive to the presence of such electrical signal to assume a second position. Current sensing means is provided for sensing current in the operating circuit and is responsive to the current sensed to produce a triggering signal to hold the holding switch to its second position. A time delay device is connected with the holding switch and is responsive to an electrical signal in the control circuit to, after a selected time delay, produce a triggering signal to switch the holding switch to its second position. The control circuit connects the holding switch with the lock-out switch and time delay device to complete a circuit to the lock-out switch when the holding switch is in its second position to thereby close such lock-out switch and to, further, complete a circuit to the time delay device when the holding switch is in the first position whereby the lock-out switch will be closed as long as both the control and operator circuits are energized but will be opened any time current is discontinued in either the operator or control circuit and will remain open until the timed delay device is re-energized for the pre-determined timed delay.