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