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1) Gantry crane

A crane similar to an overhead crane except that the bridge for carrying the trolley or trolleys (with lifting device) is rigidly supported on two or more legs running on fixed rails or other runway.

2) Industrial crane

A machine for lifting and lowering a load, and moving it horizontally.  Drives may be manual, power, or a combination of both and utilized totally in an industrial environment.

3) I-beam crane

An overhead traveling bridge crane that utilizes standard I-beam (S beams) as the bridge girder and at times also utilizes I beams as the runway beams.  Cranes that utilize H-beams (structural beams) as girder and runways are sometimes referred to as I-beam cranes as opposed to patented track cranes.

4) Hand trolley

A trolley or carrier, generally suspended from a monorail or crane bridge, that is capable or designed to be propelled manually.  A push-pull trolley.