The device includes a circuit in parallel with {TAIL ~ the switch} which contains a transistor and a diode to cause such voltage drop in the circuit as to prevent {HEAD ~ current} flowing through a second diode when the switch is closed 
The device includes a circuit in parallel with { TAIL ~ the switch } which contains a transistor and a diode to cause such voltage drop in the circuit as to prevent { HEAD ~ current } flowing through a second diode when the switch is closed
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH