{TAIL ~ The leveling apparatus} can keep a horizontal level of the upper swing structure against {HEAD ~ an inclined ground} 
{ TAIL ~ The leveling apparatus } can keep a horizontal level of the upper swing structure against { HEAD ~ an inclined ground }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD