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3 ton gantry crane ,also known as a portable gantry crane or a mobile gantry crane, is a type of crane that is designed for easy mobility and port ability. It consists of a gantry structure with two vertical legs and a horizontal beam, similar to a bridge, which supports a trolley and hoist mechanism for lifting and moving loads.
link:https://www.kinocranes.sg/overhead-crane/3-ton-gantry-crane.html
3 Ton Gantry Crane | Kenancranes