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| Number | Title | Issue Date |
| 6113340 | Automatic Debris removal system An automatic debris removal system for use in combination with a pre-existing construction hoist of the type including a plurality of telescoping extension members. Such a hoist includes a carriage device which traverses the extended hoist by means of a c... | 09/05/2000 |
| 5951230 | Self dumping hopper with container locking mechanism A self dumping hopper includes a base; a container having a pair of runners sized and configured to enable the container to rock upon the base, along a path and between a non-dumping rest position and a rearwardly angled dumping position; a guide assembly... | 09/14/1999 |
| 4475758 | Lifting fork A lifting fork intended to be suspended from a lifting member, e.g. a lifting hook (4) of a hoisting crane, and which includes forks (2), a lifting shank (3) to which a movable attachment (7,11,14) for the lifting hook (4) is attached, and a connecting ba... | 10/09/1984 |
