This U.S. industry comprises establishments primarily engaged in (1) manufacturing oil and gas field machinery and equipment, such as oil and gas field drilling machinery and equipment; oil and gas field production machinery and equipment; and oil and gas field derricks, and (2) manufacturing water well drilling machinery. Establishments primarily engaged in--

Including:

• Bits, rock drill, oil and gas field-type, manufacturing
• Christmas tree assemblies, oil and gas field-type, manufacturing
• Derricks, oil and gas field-type, manufacturing
• Drilling equipment, oil and gas field-type, manufacturing
• Drilling rigs, oil and gas field-type, manufacturing
• Gas well machinery and equipment manufacturing
• Oil and gas field-type drilling machinery and equipment (except offshore floating platforms) manufacturing
• Rock drill bits, oil and gas field-type, manufacturing
• Water well drilling machinery manufacturing
• Well logging equipment manufacturing