Document MGnK17KD3jRQdNRYDkX5qYLwk

Date Joined 1936 1960 1963 1960 1953 1942 Company Johns-Manville Corporation Jones It Laughlin Steel Corp. Jowitt & Rodgers Company Kaiser Refractories Division Kaiser Aluminum h Chem. Corp. Kennecott Copper Corporation Koppers Company, Inc. Date Joined 1964 1937 1955 1938 1961 1937 1950 Company Pittsburgh Activated Coal Company Pittsburgh Plate Glass Company Pittsburgh Steel Company Portland Cement Association Powdered Products Company Process Air Division American Air Filter Company Pullman-Standard 1937 1964 1936 1958 1962 Lava Crucible-Refractories Co. Laverack It Haines, Inc. Lead Industries Association London Transport Board Louisiana Ordnance Plant Remington Rand Division Sperry Rand Corporation 1937 1950 1940 1937 1964 1937 1936 1957 1956 Maeklin Company Manhattan Rubber Division Raybestos-Manhattan; Inc. Maryland Self-Insurers' and Employers' Compensation Assn. J. S. McCormick Company Merck It Co., Inc. Mid-West Abrasive Company Mine Safety Appliances Company Minnesota Mining It Manufacturing Co. Jesse S. Morie It Son, Inc. 1945 1937 1947 1937 1937 1937 1964 1945 1938 1947 1962 1964 National Association of Mutual Casualty Companies * National Crushed Stone Assn., Inc. National Glass Sand Corporation National Grinding Wheel Co., Inc. National Industrial Sand Assn. National Lead Company National Ready Mixed Concrete Assn. National Sand and Gravel Assn., Inc. National Slag Association National Steel Corporation Nederland duPont deNemours N. V. Newport Division Heyden Newport Chemical Corp. 1963 1937 1953 1936 Osborn Manufacturing Company Ottawa Silica Company Owens-Coming Fiberglas Corp. Owens-Illinois Glass Company 1954 1954 1937 1937 1956, 1964 I960 1936 1951 Pacific Grinding Wheel Manufacturing G. H. Packwood Manufacturing Co. Peninsular Grinding Wheel Division Wakefield Corporation Pennsylvania Glass Sand Corp. Pennsylvania Manufacturers' Assn. Casualty Insurance Company Perkin-Elmer Corporation Petroleo Brasileiro S. A. Phelps Dodge Corporation Philadelphia Quartz Company 1957 1952 1945 1937 1956 Reaction Motors Division Thiokol Chemical Corporation Red Hill Grinding Wheel Corp. Republic Steel Corporation H. H. Robertson Company Robertson Manufacturing Company 1939 1937 1950 1956 1937 1946 1937 1937 1956 1949 1941 1964 1962 1937 1963 1953 Safety First Supply Company St. Joseph Lead Company Sandia Corporation Sauereisen Cements Company Claude B. Schneible Company Scott Aviation Corporation Simonds Abrasive Company Simonds Worden White Company Soap and Detergent Association-- -- Socony Mobil Oil Company, Inc. Standard Lime and Cement Company Standard Oil Company (New Jersey) Stauffer Chemical Company Sterling Grinding Wheel Company Stiffler Industrial Lubricants Co. Sugar Beet Products Company 1952 1946 1946 1938 1937 I960 Tata Industries Limited Taylor, Smith It Taylor Company Tennessee Copper Company Division of Tennessee Corp. Texas Gulf Sulphur Company Titan Abrasives Company Toms River-Cincinnati Chemical Corporation 1936 1936 1936 Union Carbide Corporation United States Potters Association United States Steel Corporation 1937 1960 1938 1937 1937 1937 1962 1937 1961 1937 1937 1937 Valley Mould and Iron Corporation Van Straaten Chemical Company Vesuvius Crucible Company * Waltham Grinding Wheel Company Washington Mills Abrasive Company Wedron Silica Company Western Electric Company, Inc. Westfield Grinding Wheel Company Westinghouse Brake and Signal Company, Limited Westinghouse Electric Corporation Whitehead Brothers Company Willson Products Division Ray-O-Vac Company Multiple Membership (27 member companies) 1937 Youngstown Sheet and Tube Company 17.