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