{TAIL ~ The housing}, generally designated 20, is formed in {HEAD ~ telescopically interfitted and welded upper and lower cupped sheet metal sections} 21, 22 respectively, which will be recognized as formed, interfitted and secured together at a medial flanged and welded area 28 in a manner which is essentially conventional in the trade 
{ TAIL ~ The housing } , generally designated 20 , is formed in { HEAD ~ telescopically interfitted and welded upper and lower cupped sheet metal sections } 21 , 22 respectively , which will be recognized as formed , interfitted and secured together at a medial flanged and welded area 28 in a manner which is essentially conventional in the trade
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