FIELD: filtering. SUBSTANCE: filtering member has outer porous frame, inner perforated pipe, end covers, and corrugated outer and inner shutter interposed between the covers. Stampings are made at the tops of the corrugations to provide inlet passageways over periphery when the corrugations are folded. The passageways are at the same distance from each other. EFFECT: improved quality of filtering. 4 dwg
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