F-m control track operation
Fail safe digital timer
Fail safe or gate
Fail-safe "and" gate circuit
Fail-safe "or" gate
Fail-safe "or" logic circuit
Fail-safe active timing circuit
Fail-safe constant amplitude signal generator
Fail-safe domain generator for single wall domain arrangements
Fail-safe electronic comparator circuit
Fail-safe electronic comparator circuit
Fail-safe electronic time delay circuit
Fail-safe level detector
Fail-safe opto-electronic phase inverting circuits
Fail-safe output switching circuit
Fail-safe pulse providing apparatus
Fail-safe pulsed logic and gate
Fail-safe signal shaping circuit
Fail-safe time delay relay
Failsafe decision circuit