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