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A rotatable, roehrenfoermiger current collector - hollow grinding body made of sheet metal of a polygonal cross section with alternately a compact operation - moderately grinding serving as a helicoidal guide and not solid sides
A rotatable, roehrenfoermiger current collector - hollow grinding body made of sheet metal of a polygonal cross section with alternately a compact operation - moderately grinding serving as a helicoidal guide and not solid sides
