. Official proceedings . Duff Barrett Automatic Lowering Jack. Duff Governor Con-trolled, Self-LoweringJack Duff Ball BearingJournal Jack Duff High BearingScrew Jack tyfie Duf-f Manufacturing Co. Est. 1883 PITTSBURGH, PA. IANCH OFFICES: ATLANTA - CHICAGO - HOUSTON - NEW YORK-ST. LOUIS - SAN FRANC NORTON JACKS FOR CAR AND LOCOMOTIVE WORK In Various Sizes and CapacitiesA Thoroughly Proven Self-Lowering Type of Ball Bearing Jack JOURNAL JACKS Of Special Design—Built For Heavy Duty A. O. NORTON, Inc. 3d Ave. at 15th , 111. 440 Brookline 310 S. MichiganChicago To Supe
. Official proceedings . Duff Barrett Automatic Lowering Jack. Duff Governor Con-trolled, Self-LoweringJack Duff Ball BearingJournal Jack Duff High BearingScrew Jack tyfie Duf-f Manufacturing Co. Est. 1883 PITTSBURGH, PA. IANCH OFFICES: ATLANTA - CHICAGO - HOUSTON - NEW YORK-ST. LOUIS - SAN FRANC NORTON JACKS FOR CAR AND LOCOMOTIVE WORK In Various Sizes and CapacitiesA Thoroughly Proven Self-Lowering Type of Ball Bearing Jack JOURNAL JACKS Of Special Design—Built For Heavy Duty A. O. NORTON, Inc. 3d Ave. at 15th , 111. 440 Brookline 310 S. MichiganChicago To Superintendents of Car Shops YOU know how much the replacement of lock nuts costsin material alone. You know the labor expense of re-placing lost nuts. And you know how this work slowsup your shop schedules. Why not standardize on lock nuts that cannot lose off; thatwill minimize nut replacements and their labor expense? Leading railroads have standardized. They are using GripNuts that always lock—securely — any place on the bolt. GRIP NUT CO., 5917 So. We
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