| 1900 : |
Cooper enters production of natural gas internal combustion engines. |
| 1905 : |
McEvoy founded to manufacture valves and wellhead equipment. |
| 1919 : |
W-K-M valves company established in Houston. |
| 1920 : |
Pennsylvania Process founded to manufacture compressors. |
| 1920 : |
Cameron Iron Works incorporated in Houston. |
| 1929 : |
Cooper merged with Bessemer. |
| 1934 : |
Thornhill-Craver established to manufacture chokes and couplings. |
| 1939 : |
Willis formed to manufacture oilfield chokes. |
| 1947 : |
Demco Valve Company founded. |
| 1951 : |
Cameron Iron Works of Canada established in Edmonton. |
| 1954 : |
Cameron purchased the British Oil Field Equipment Company of London and Leeds. |
| 1955 : |
Joy Manufacturing Company founded in Buffalo, New York. |
| 1958 : |
En-Tronic Controls Group established within Cooper. |
| 1963 : |
Ajax and Pennsylvania Process acquired by Cooper. |
| 1965 : |
Cooper Industries began major diversification program leading to major operations in electrical, automotive and tools and hardware industries. |
| 1967 : |
Cooper Industries headquarters moved to Houston. |
| 1978 : |
Cooper Rolls joint venture between Cooper Industries and Rolls-Royce established to market gas turbines. |
| 1987 : |
Joy Industrial Compressor Group became Cooper Turbocompressor, now part of Cooper Compression. |
| 1987 : |
W-K-M and Demco acquired by Cooper Flow Control Division. |
| 1987 : |
McEvoy and Willis acquired by Cameron Iron Works. |
| 1988 : |
Enterprise Engine aftermarket services business acquired by Cooper. |
| 1989 : |
Cameron Iron Works acquired by Cooper Industries and renamed Cooper Oil Tool. |
| 1994 : |
Cooper Industries announced intention to spin off its Petroleum and Industrial Equipment Group to focus on its Electrical Products, Automotive Products and Tools & Hardware businesses 1995. |
| 1995 |
Cooper Cameron Corporation spun off as publicly traded company with separate management group; Wheeling Machine Products Company's oilfield couplings business sold. |
| 1995 : |
Cameron and Cooper Cameron Valves divisions formed from Cooper Oil Tool. |
| 1996 : |
Ingram Cactus Corporation and Tundra Valve & Wellhead Corporation acquired and combined into Cameron division; certain assets of Enox Technologies, Inc. acquired and combined into Cooper Energy Services division. |
| 1997 : |
Wellhead Services, Inc. and Marta Co. acquired and combined into Cameron division; Daniel Ball Valve acquired and combined into Cooper Cameron Valves division. |
| 1998 : |
Orbit Valve International acquired and combined with Cooper Cameron Valves division; Ajax Repair & Supply, General Turbine Systems and PDQ Machine acquired and combined into Cooper Energy Services division; Brisco Engineering acquired and combined into Cameron division. |
| 1999 : |
Rotating compressor business sold to Rolls-Royce. |