The locking tab can be removed from the fastening channels by pulling one or both ends of the tab away in {HEAD ~ a direction} substantially perpendicular to {TAIL ~ the header} to disengage the flanges from said channels 
substantially perpendicular to
The locking tab can be removed from the fastening channels by pulling one or both ends of the tab away in { HEAD ~ a direction } substantially perpendicular to { TAIL ~ the header } to disengage the flanges from said channels
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH