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a. A broad pulley or wheel fixed to the floor, roof, or sides of roadways
to prevent a haulage rope running against the ground that would cause
excessive friction and wear of rails and sleepers. Nelson
b. A component part of a roller chain in which it may serve only to reduce
frictional loss occurring as the chain negotiates sprockets. Rollers may
also serve as the rolling support for the chain and the load being
conveyed.
c. A heavy vehicle used for compacting soil, earth fill, and top layers of
spoil dumps to increase the density and bearing capacity of the material.
Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms
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