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