In {TAIL ~ its closed condition}, {HEAD ~ the abutment structure} is capable of receiving a forcible impulse by an implement, such as an iron, advancing along the upper surface of the seaming board 
In
In { TAIL ~ its closed condition } , { HEAD ~ the abutment structure } is capable of receiving a forcible impulse by an implement , such as an iron , advancing along the upper surface of the seaming board
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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