Factory and industrial management . {BOLTS. :4*itNS/DE CONNECTIONS,ATDffILL HOLE INTOCOAL MINE. FIG. H. OUTSIDE AND INSIDE CONNECTIONS FOR A PIPE LINE ENTERING A MINE THROUGH A DRILL HOLE. n /S l Uli ENGINEERING MAGAZINE. MINE ITOOF

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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering