A device supports {HEAD ~ the assembly} from {TAIL ~ a support} and a safety device loosely extends from a first channel to the second channel 
from
A device supports { HEAD ~ the assembly } from { TAIL ~ a support } and a safety device loosely extends from a first channel to the second channel
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH