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B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
B04C1/00—Apparatus in which the main direction of flow follows a flat spiral ; so-called flat cyclones or vortex chambers
FR791108D1934-08-301934-08-30
Improvements to processes and apparatus for separating sludge and mixtures and for removing dust from gases
ExpiredFR791108A
(en)