Nowadays, a commonwealth has come to mean any government in which all people involved have a say, or a loose formation of nations with a shared loyalty. It is also the official designation of a few states including, Kentucky, Massachusetts, Pennsylvania, and Virginia and some U.S. territories.
1 Pneumatic tools are powered by compressed air. 2  Common types of these air-powered hand tools that are used in industry include buffers, nailing and stapling guns, grinders, drills, jack hammers, chipping hammers, riveting guns, sanders and wrenches.
hydraulic power. HPU with pneumatic driven hydraulic pump Natural gas powered HPU Electric motor driven systems are composed of six basic components: electric motor, hydraulic pump, reservoir tank, accumulator, pressure vessel and thermal volume motor control. In the event of an electrical power failure, pressurized fluid is retained in the system.