first and second electric devices mounted in {TAIL ~ said second body} and having {HEAD ~ an input means} which includes first and second input parts, said first electric device being energized only when said first and second input parts are charged positive and negative, respectively, said second electric device being energized only when said first and second input parts are charged negative and positive, respectively; and 
first and second electric devices mounted in { TAIL ~ said second body } and having { HEAD ~ an input means } which includes first and second input parts , said first electric device being energized only when said first and second input parts are charged positive and negative , respectively , said second electric device being energized only when said first and second input parts are charged negative and positive , respectively ; and
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH