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A self-contained transportable stone duster. A high-velocity current of
air from a fan or blower is mechanically fed from a hopper above, both the
fan and the feeding mechanism being driven from the tub axle as it is
drawn along by rope haulage, horse, or manually. It delivers about 3/4 lb
(0.34 kg) of dust per yard (0.9 m) of travel. Sinclair, 1
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