| 摘要 |
PCT No. PCT/EP96/03214 Sec. 371 Date Sep. 14, 1998 Sec. 102(e) Date Sep. 14, 1998 PCT Filed Jul. 20, 1996 PCT Pub. No. WO97/04850 PCT Pub. Date Feb. 13, 1997A multiple tube filter made of at least one perforated filter element (15), wherein the outside of the filter element (15) has spirally circulating grooves (2), and the surface between grooves (2) is preferably arched outward in the form of a segment of a circle.
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