جاك الكسارات أستراليا
جاك مطحنة الأسطوانة Jack (device) Wikipedia. A jack, screwjack or jackscrew is a mechanical device used as a lifting device to lift heavy loads A hydraulic jack uses a liquid, which is incompressible, that is forced into a cylinder by a pump plunger. . up ^ George William Sutcliffe (1895), Steam power and mill work principles and modern practice ...