Hydraulic Machinery : Machinery producing, controlling, or powered by pressurised liquid. The working liquid is usually oil-based. Includes pumps, control valves, motors, cylinders, etc
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}