Section R. 408.15406 - Definitions; T to WRule 5406.
(1) "Tip speed" means the distance a rotary blade tip covers in 1 minute, or circumference in feet times revolution during a 1 minute interval.(2) "Two stage snow thrower" means a snow thrower with the impeller as a separate unit from the collector.(3) "Walk-behind mower" means a grass cutting machine either pushed or self-propelled, controlled by an operator walking behind the unit.(4) "Walk-behind snow thrower" means a snow thrower either pushed or self-propelled, controlled by an operator walking behind the unit.Mich. Admin. Code R. 408.15406