a processing part configured to perform an inverting processing on a signal to be provided to said device so that {HEAD ~ a provided direction} of said {TAIL ~ contents inverts} when said mounting direction is inverted 
a processing part configured to perform an inverting processing on a signal to be provided to said device so that { HEAD ~ a provided direction } of said { TAIL ~ contents inverts } when said mounting direction is inverted
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 REL OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH