Referring to FIG 20, {HEAD ~ degradation display system} 100A includes vehicle 10, power cable 20, power station 30, {TAIL ~ charging/discharging device} 40A, display terminals 50A to 50C, and a data communication network 60 
Referring to FIG 20 , { HEAD ~ degradation display system } 100A includes vehicle 10 , power cable 20 , power station 30 , { TAIL ~ charging / discharging device } 40A , display terminals 50A to 50C , and a data communication network 60
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH