Manhole cover construction
United States Patent 3218942
US Patent References:
/0689224.html
- - 0689224

/0797585.html
- - 0797585

Manhole-top
- - 1364422

Manhole closure
- - 1859739

Manhole structure
- - 2997932


Inventors:
Armin, Raquet
Publication Date:
11/23/1965
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Assignee:
Kaiserslautern, Guss Armatur
Primary Class:
404/26
Other Classes:
220/3.700
International Classes:
E02D29/14; G09F3/02
US Patent References:
3046853Manhole closure
Foreign References:
GB201018A
GB374697A
GB535177A
IT562414B