A lock screw is interlocked in engagement between the cover and the at least one end frame to obviate {HEAD ~ displacement} of {TAIL ~ the interconnecting means} from their respective interconnections in releasable engagement with each other 
A lock screw is interlocked in engagement between the cover and the at least one end frame to obviate { HEAD ~ displacement } of { TAIL ~ the interconnecting means } from their respective interconnections in releasable engagement with each other
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH