Document MJ500OoX716e0ovROgqOnkY6x

Kennecott Copper Corporation Keystone Brass Works, Inc. Koppers Company, Inc. Laundry k Cleaners Allied Trades Assn. Laverack k Haines, Inc. Lead Industries Association London T ransport Board Macklin Company' Manufacturing Chemists Assn. , Inc. Mareona Mining Company Maryland Self-Ins. k Empl, Comp. Assn. J. S. McCormick Company Merck and Company, Inc.' Metropolitan Life Insurance Company Mid-West Abrasive Company Miles Laboratories, Inc. Mine Safety Appliances Company 'Minnesota Mining k Manufacturing Co. Mobil Oil Corporation Jesse S. Morie k Son, Inc. Kalco Chemical Company Freeport Division National Coal Association National Crushed Stone Association, Inc. National Class Sand Corporation National Grinding Wheel Company, Inc. National Industrial Sand Association National Insulation Manufacturers Assn. National Lead Company National Sane k Gravel Association, Inc. National Slag Association Nederland cu For.; de Nemours N.V. Osborn Manufacturing Company Ottawa Silica Company Owens-Corning "iberglas Corporation Owens-Illinois Class Company Pacific Grinding Wheel Manufacturing Co. G. H. Packwood Manufacturing Company Pennsylvania Glass Sand Corporation..Pennsylvania Mfrs'.' Assn. Ins. Co. Pc rkin-Elmtr Ccrporation Petrcleo Erasi'.eiro S.A. Philadelphia C'uart: Company ' ' Pittsburgh Activated Carbon Company Pittsburgh Plate Class Company Pittsburgh Steel Company .H. K. Porter Company, Inc. S-.m.ondr Wcrcer. White Works Portland Center.: Association Raybestos-Manhattan, Inc. Manhattan Rubber Division Red Hill Grinding Wheel Corporation Republic Steel Corporation H. H. Robertson Company Robertson Manufacturing Company Safety First Supply Company St, Joseph Lead Company Sandia Corporation Sauereisen Cements Company Simonds Abrasive Company 5inclair-Koppers Company' Soap and Detergent Association Sperry Rand Corporation Louisiana Army Ammunition Plant -Standard Oil Company (New Jersey) Stauffer Chemical Company Sterling Grinding Wheel Company. Sturm. Ruged k Company. Inc. Sugar Beet Producta Company Tata Services Limited Tennessee Copper Company Texas Guif'Suiphur Company Thiokol Chemical Corporation Reaction Motors Division Titan Abrasives Company Toms River Chemical Corporation Union Carbide Corporation United States Potters Association United States Steel Corporation Valley Mould and Iron Corporation Van Straaten Chemical Company Vesuvius Crucible Company Wakefield Corporation Peninsular Grinding Wheel Division Waltham Grinding Wheel Company Washington Mills Abrasive.Company Wedron Silica Company Western Electric Company, Inc.. .Yj., Westfield Grinding Wheel Company' Wcstlnghouse Brake and Signal Company Westinghouse Electric Corporation ' West Virginia Pulp and Paper Company - Bleached Board Division - - . I-ZkIu <- .:i;p-~ ic.H5eo / TI A 6 18