| 摘要 |
PCT No. PCT/FR97/02187 Sec. 371 Date Jul. 17, 1998 Sec. 102(e) Date Jul. 17, 1998 PCT Filed Dec. 3, 1997 PCT Pub. No. WO98/25066 PCT Pub. Date Jun. 11, 1998An interfitting modular metal duct made up of elements forming an inner duct, pairs of elements being united by respective collars, sealing between the two elements being provided by a lip gasket and a fold chamber mounted in the female end of an element and bearing against the outside surface of the corresponding male portion. |
