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| Number | Title | Issue Date |
| 5623743 | Mobile surface scrubber solution recovery system A mobile surface scrubber for scrubbing a surface wetted with cleaning solution. The scrubber comprises a frame, a plurality of wheels rotatably mounted on the frame, scrub brush means attached to the frame and positioned to scrub the wetted surface as th... | 04/29/1997 |
| 5588179 | Dust box emptying device A flap of an elastomeric material is disposed over an outlet opening in a dust box within a main hopper of an industrial-type sweeper, the outlet opening providing communication between the dust box and the main hopper for emptying of the contents accumul... | 12/31/1996 |
| 5194077 | Dual chamber filter assembly with shaker A sweeper hopper and associated filter assembly as illustrated and described. The filter assembly effectively divides the hopper into a particulate contaminant receiving chamber and a clean air exhaust chamber. The filter assembly includes at least a pair... | 03/16/1993 |
