发明名称 COVERING FOR A SEWER MANHOLE
摘要 The invention relates to a covering for a sewage manhole having a manhole cover (1) provided with openings (2) to allow passage of sewage. A filter element (3) is arranged on the lower side of said manhole cover and covers the region of the openings (2), said filter element (3) extending into and closing the openings (2), and being substantially flush with the upper surface of the manhole cover (1).
申请公布号 CA2249270(A1) 申请公布日期 1997.09.25
申请号 CA19972249270 申请日期 1997.03.18
申请人 FLEISCHHACKER, GERHARD 发明人 FLEISCHHACKER, GERHARD
分类号 E02D29/14;E03F5/06;E03F5/14;(IPC1-7):E02D29/14;E01C11/22 主分类号 E02D29/14
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