Section R. 408.13806 - Definitions; J to MRule 3806.
(1) "Jack" or "ram" means a device, except an automobile bumper jack, used for lifting, lowering or moving a load by application of a pushing force.(2) "Low velocity tool" means a device which, when used with an explosive load, propels a fastener at a velocity less than 300 feet per second when measured 6 1/2 feet from the muzzle end of the tool.(3) "Mushroom" means to overrun the shank or head of a tool by battering the striking end.Mich. Admin. Code R. 408.13806