It can be seen that two clips 18 are locked to the exterior and intermediate sheets 15 and 16, and the clips 18 at {TAIL ~ their corrugations} 22 are locked to {HEAD ~ the sheets} 16 16 and 17 17 
It can be seen that two clips 18 are locked to the exterior and intermediate sheets 15 and 16 , and the clips 18 at { TAIL ~ their corrugations } 22 are locked to { HEAD ~ the sheets } 16 16 and 17 17
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH