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METHOD OF AND APPARATUS FOR SHAPING BY PLASTIC WORKING SCREW-TYPE LONG-PITCH ARTICLES IN PARTICULAR HELICALLY CORRUGATED TUBES FOR MANUFACTURING ROTORS OF SCREW PUMPS
METHOD OF AND APPARATUS FOR SHAPING BY PLASTIC WORKING SCREW-TYPE LONG-PITCH ARTICLES IN PARTICULAR HELICALLY CORRUGATED TUBES FOR MANUFACTURING ROTORS OF SCREW PUMPS