The apparatus incorporates a frame structure having {HEAD ~ a hydraulically driven slide support} guided by {TAIL ~ parallel structural members} of the frame 
guided by
The apparatus incorporates a frame structure having { HEAD ~ a hydraulically driven slide support } guided by { TAIL ~ parallel structural members } of the frame
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH