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