a. In nonmetal mining, a laborer who breaks up large stones with a sledge hammer or pneumatic drill so they will pass through grizzly (grating) in a limestone mine. DOT
b. A horizontal machine, usually mechanical, having two bull gears with eccentric pins, two connecting links to a ram, and dies to perform bending, forming, and punching of narrow plate and bars. ASM, 1
c. A cleaning blade that follows the wheel or ladder of a ditching machine. Nichols, 1
d. A tractor on the front end of which is mounted a vertically curved steel blade held at a fixed distance by arms secured on a pivot or shaft near the horizontal center of the tractor. The blade can be lowered or tilted vertically by cables or hydraulic rams. It is a highly versatile piece of earth excavating and moving equipment esp. useful in land clearing and leveling work, in stripping topsoil, in road and ramp building, and in floor or bench cleanup and gathering operations. Also called dozer.
Source:
Dictionary of Mining, Mineral, and Related Terms












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