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As applies to Members of the Material Handling Industry of America (MHIA), this term usually applies to manufacturers of overhead traveling cranes, jib cranes, stacker cranes, and gantry cranes to the exclusion of mobile cranes, tower cranes or devices otherwise referred to as construction cranes.
The stacker crane in appearance looks like a conventional bridge crane except that in place of a hoist, a rotating ridged or telescoping mast is suspended from the bridge trolley with the mast equipped with a load handling device such as single or double forks or a grab. These cranes can be manually operated or powered and are used where the carne spans multiple aisles allowing for the storage and retrieval within any aisle of items such as coils of steel.
The use of sensors to transmit data via pulse-modulated light beam systems typically from host stations to mobile carriers such as AGV's or stacker cranes.