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Charles Kettering
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| Number | Title | Issue Date |
| 6938699 | Variable angle powered work implement A walk-behind power unit is configured to detachably mount a variety of work implements to perform a corresponding variety of operations from a single power unit. The power unit includes an implement mounting mechanism that is pivotable about a generally vertical pi... | 09/06/2005 |
| 6883616 | Walk-behind landscape edger/trencher A walk-behind trenching implement has a side mounted rotary trenching tool for creating a profiled trench into the surface of the earth, which can also be used as an implement to edge landscape beds. The trenching implement is powered by an engine that delivers rota... | 04/26/2005 |