{TAIL ~ The horizontal advancing seat} is mounted on the slide block of {HEAD ~ the vertical advancing seat} and is provided with a slide block capable of sliding along the horizontal advancing seat in the horizontal direction relative to the base 
{ TAIL ~ The horizontal advancing seat } is mounted on the slide block of { HEAD ~ the vertical advancing seat } and is provided with a slide block capable of sliding along the horizontal advancing seat in the horizontal direction relative to the base
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD 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