A lifting device, usually portable, for lifting heavy weights by force acting from below; in the commonest form, having a rack and a pinion wheel or screw and a handle turned by hand.
A lifting device, usually portable, for lifting heavy weights by force acting from below; in the commonest form, having a rack and a pinion wheel or screw and a handle turned by hand.
A lifting device, usually portable, for lifting heavy weights by force acting from below; in the commonest form, having a rack and a pinion wheel or screw and a handle turned by hand.