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| Number | Title | Issue Date |
| 5580113 | Remote control crane/load safety shackle A crane/load safety shackle that includes a yoke having a slot that opens along one side edge of the yoke, and a buckle opening for securing the yoke to a crane load line such that the slot opens downwardly. A pin moveably slidably extends laterally acros... | 12/03/1996 |
| 5297920 | Apparatus and method for removing ballast stones from a roof A conveyor system comprising a platform positioned above and spaced from a building roof for receiving a motorized or manual stone ballast transport cart, and a conveyor positioned beneath the platform for receiving ballast stones unloaded from the cart a... | 03/29/1994 |
| 4787111 | Selectively-retractable elevated walkway extension A selectively positionable extension for an elevated walkway includes a planar ramp mounted by rollers to a frame and coupled to the frame by a selectively extensible hydraulic ram. The frame itself is supported by a second ramp for controlled vertical po... | 11/29/1988 |
