| 摘要 |
Boom-type lift vehicles, including such vehicles already existing, are convertible to boom-mast-type vehicles, by means of a mast having a simple connector system which enables it to replace removable forks leaving pivotal linkages at boom' s-end undisturbed. The mast has nonpivoting attachment to a frame which remains pivotally mounted at boom's-end. The replaced forks can be used on the elevator carriage of the mast.
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