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| Number | Title | Issue Date |
| 7004285 | Load-sensing mechanism for aerial work apparatus An aerial work apparatus having a boom mounted to a base, a platform attached to the distal end of the boom, a boom mechanism for positioning the platform, a boom control module mounted with respect to the platform, a vertical load-sensing mechanism mounted at the p... | 02/28/2006 |
| 4345539 | Warning system with pneumatic function generator A totally pneumatic crane warning system is disclosed capable of use in oil well environments. The crane warning system utilizes a pneumatic function generator. The pneumatic function generator includes a means for receiving a linear pneumatic signal that... | 08/24/1982 |
| 4283722 | Overload indication device for a lever hoist An overload indication device for a lever hoist comprises an operating lever consisting of a main lever and a handle having one end pivoted to the main lever, a spring for normally holding the handle in an aligned position with the main lever, a magnifica... | 08/11/1981 |
