US7574850B1. Caster wheel locking system for walk-behind mower. Google Patents Publication number US7574850B1 US7574850B1 US12/136,488 US13648808A US7574850B1 US 7574850 B1 US7574850 B1 US 7574850B1 US 13648808 A US13648808 A US 13648808A US 7574850 B1 US7574850 B1 US 7574850B1 Authority US United States Prior art keywords caster traction drive wheels caster wheel drive bar Prior art date 2008-06-10 Legal status (The […]

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