Further, as shown in FIG 9, the relief valve 89 and a check valve 97 are provided at {HEAD ~ each} of {TAIL ~ left and right side portions} of the fixed member 91 
of
Further , as shown in FIG 9 , the relief valve 89 and a check valve 97 are provided at { HEAD ~ each } of { TAIL ~ left and right side portions } of the fixed member 91
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH