Lucas, Harry G. Multiple-orifice feeder for fine particles Lucas, Harry G.; Smith, N. S. Jr. - Washington Bureau of mines 1974 - 5 p. - RI 7944 . Subjects--Topical Terms: MINERIAMINING Subjects--Index Terms: MAQUINAS DE MINERIA DE CARBON MINA DE POLVOS COAL-MINING MACHINERY MINE DUSTS Universal Decimal Class. No.: 622