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A high-air-pressure directional machine which operates in the manner of a
whitewashing machine and displaces coal dust from the roof and sides. This
machine carries 2 st (1.8 t) of stone dust, and traveling at 11 ft/min
(3.4 m/min) distributes over 26 lb/min (11.8 kg/min) of dust.
Sinclair, 1
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