. Official proceedings . 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. INSPECT YOUR EQUIPMENT— P. T. L. Inspectors are thoroughly familiar with wtiry railway equipment—they know shop practicOT and thtirservice will be highly satisfactory. Bulletins 20 and 21 Explain P. T. L. Service la Detail. PITTSBURGH TESTING LABORATORY Inspection Engineers and ChemistsPITTSBURGH. The NutWith the Star Crown SPECIFYSELFLOCK UNIT NUTS THEY LOCK ON EVERY THREAD GRA
. Official proceedings . 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. INSPECT YOUR EQUIPMENT— P. T. L. Inspectors are thoroughly familiar with wtiry railway equipment—they know shop practicOT and thtirservice will be highly satisfactory. Bulletins 20 and 21 Explain P. T. L. Service la Detail. PITTSBURGH TESTING LABORATORY Inspection Engineers and ChemistsPITTSBURGH. The NutWith the Star Crown SPECIFYSELFLOCK UNIT NUTS THEY LOCK ON EVERY THREAD GRAHAM BOLT& NUT CO. PITTSBURGH
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