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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0515986 (1995-08-16) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 40 인용 특허 : 66 |
A manhole cover and frame assembly includes an outer frame having a support surface and a side wall that extends upward from the support surface and has a recessed portion. An inner frame is supportable on the support surface. The inner frame has a protrusion extending from the outer peripheral surf
A manhole frame assembly comprising an outer frame member and an inner frame member that can be received by said outer frame member, said outer frame member having a support surface and a side wall that extends upwardly from the support surface, said side wall having a recessed portion that is at le
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