when said mounting direction is inverted, said processing part performs an inverting processing on {HEAD ~ said signal} to be provided to said {TAIL ~ device} so that a provided direction of said contents inverts, while not performing said inverting processing on said signal to be provided to said external output unit, and 
to be provided to
when said mounting direction is inverted , said processing part performs an inverting processing on { HEAD ~ said signal } to be provided to said { TAIL ~ device } so that a provided direction of said contents inverts , while not performing said inverting processing on said signal to be provided to said external output unit , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL OTH 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 OTH OTH OTH OTH