发明名称 Closure for cylindrical pipe
摘要 A closure for covering and providing access to the interior of a cylindrical pipe or the like is disclosed. The closure has a cap portion and a cover portion, the cap portion being secured to the end of a pipe to which access is desired and the cover is adapted to be releasably attached to cover the aperture in the cap portion. By removing the cover, special tools or the like can be inserted through the aperture of the cap portion for the intended purpose. The closure is preferably made of a nonmetallic material and has a ferromagnetic member attached to the interior of one of the cap and cover portions to enable a metal detector to find the same when the closure is applied below grade.
申请公布号 US4060100(A) 申请公布日期 1977.11.29
申请号 US19760684536 申请日期 1976.05.10
申请人 MILLER, GERALD V.;ZEH, DAVID W. 发明人 MILLER, GERALD V.;ZEH, DAVID W.
分类号 F16L55/11;(IPC1-7):F16L55/10 主分类号 F16L55/11
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