. Official proceedings . The Manufacture of Seamless Steel Tubes By H. E. PASSMORE. JR.,National Tube Company, Pittsburgh, Pa. Steel Car Forge Company PITTSBURGH, PENNSYLVANIA FORCINGS Dieter Lock and Holding Nuts STANDARD SAFETY NUTCORPORATION. 30 CHURCH ST. NEW YORK LEWIS IRON, The Iron Superior Penn Iron & Steel Company, Creighton, Pa. SOLE SALES AGENTS,Joseph T. Ryerson & Son, Inc., Chicago, III. LET P. T. L. INSx>ECT YOUR EQUIPMENT— P. T. L. Inspectors are thoroughly familiar with tv^try railway equipment—they know shop practices and theirservice will be highly satisfactory. Bu
. Official proceedings . The Manufacture of Seamless Steel Tubes By H. E. PASSMORE. JR.,National Tube Company, Pittsburgh, Pa. Steel Car Forge Company PITTSBURGH, PENNSYLVANIA FORCINGS Dieter Lock and Holding Nuts STANDARD SAFETY NUTCORPORATION. 30 CHURCH ST. NEW YORK LEWIS IRON, The Iron Superior Penn Iron & Steel Company, Creighton, Pa. SOLE SALES AGENTS,Joseph T. Ryerson & Son, Inc., Chicago, III. LET P. T. L. INSx>ECT YOUR EQUIPMENT— P. T. L. Inspectors are thoroughly familiar with tv^try railway equipment—they know shop practices and theirservice will be highly satisfactory. Bulletins 20 and 21 Explain P. T. L. Service &n Detail. PITTSBURGH TESTING LABORATORY Inspection Engineers and ChemistsPITTSBURGH. PA.
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