John W. Danforth Co. Inc., Tonawanda, N.Y., acquired a majority of the assets of Orchard Park-based Niagara Frontier Sheetmetal Inc., a 28-year-old sheet metal fabricator and installer. Terms of the deal were not disclosed. John W. Danforth had sales of $93 million in 2003 (No. 23 on PM's 2004 Pipe Trades Giants list), while Niagara Frontier Sheetmetal ranked as one of the 50 fastest growing companies in Western New York and had $8 million in sales last year.