Further, since the forward voltage drop comparable with the forward voltage drop caused by the second diode can be generated between the second power supply and the second device by the fourth diode, {HEAD ~ the second predetermined voltage} is properly supplied to {TAIL ~ the second device} 
Further , since the forward voltage drop comparable with the forward voltage drop caused by the second diode can be generated between the second power supply and the second device by the fourth diode , { HEAD ~ the second predetermined voltage } is properly supplied to { TAIL ~ the second device }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL