When, however, {HEAD ~ the end flap structure} does not have {TAIL ~ an inwardly directed force} applied thereto, the construction thereof is such that the end flap structure will be maintained in a generally extended condition facilitating manual grasping thereof 
not have
When , however , { HEAD ~ the end flap structure } does not have { TAIL ~ an inwardly directed force } applied thereto , the construction thereof is such that the end flap structure will be maintained in a generally extended condition facilitating manual grasping thereof
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL 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 OTH OTH OTH OTH OTH