In a fourth aspect of the present invention, in addition to the first aspect, {HEAD ~ the gate} is connected to {TAIL ~ a portion} of the groove, i.e., the portion not forming a sealing surface of the seal 
is connected to
In a fourth aspect of the present invention , in addition to the first aspect , { HEAD ~ the gate } is connected to { TAIL ~ a portion } of the groove , i.e. , the portion not forming a sealing surface of the seal
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH