This industry comprises establishments primarily engaged in manufacturing oil and gas field and underground mining machinery and equipment. Illustrative Examples: Coal breakers, cutters, and pulverizers manufacturing Core drills, underground mining-type, manufacturing Mineral processing and beneficiating machinery manufacturing Mining cars manufacturing Oil and gas field-type derricks manufacturing Oil and gas field-type drilling machinery and equipment (except offshore floating platforms) manufacturing Stationary rock crushing machinery manufacturing Water well drilling machinery manufacturing Establishments primarily engaged in--