Manhole closure
United States Patent 3046853
US Patent References:
/0559164.html
- - 0559164

Manhole top
- - 1447256

Manhole cover
- - 1673145

Valve box
- - 1710571

Grease trap and cover for same
- - 1746992


Inventors:
Cyrille, Legendre
Publication Date:
07/31/1962
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Assignee:
Cyrille, Legendre
Primary Class:
404/25
Other Classes:
473/545, 220/284
International Classes:
E02D29/14
Foreign References:
GB199912A
GB263962A
GB444212A
GB492190A
GB535177A