请问manlifts和 telescopic handlers是什么意思

请问manlifts和 telescopic handlers是什么意思
RT.原句是这样的,Load-control valves – also known as over-centre valves,counterbalance valves,hose-burst check valves or boom-lock valves – are critical for the control and safety of hydraulically controlled machines such as manlifts,telescopic handlers and backhoe loaders,or where the movement of a hydraulically supported load has to be controlled.这篇文章是讲阀（valve）的,根据推测那两个词应该是指某两种工程机械之类的,