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