A second operative position is defined when {HEAD ~ the first or second channel} is disconnected from {TAIL ~ the panel} such that the safety device taughtly extends between the first and second channels in order to support the second channel 
is disconnected from
A second operative position is defined when { HEAD ~ the first or second channel } is disconnected from { TAIL ~ the panel } such that the safety device taughtly extends between the first and second channels in order to support the second channel
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH