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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0941799 (1978-09-12) |
우선권정보 | DE-2741346 (1977-09-14); DE-2805869 (1978-02-11) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 31 인용 특허 : 0 |
A vertically adjustable manhole cover assembly having a fixed annular support member, and a vertically adjustable annular member supported therein. The support member is provided with sets of graduated supports symmetrically mounted on its inner surface, and the adjustable member has sets of complem
A vertically adjustable manhole cover assembly comprising: a fixed annular support member; graduated stop means mounted on the inside surface of said support member; a vertically adjustable annular member dimensioned for rotation within the periphery formed by said stop means; graduated tooth means
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