Manhole cover

Details Manhole cover Manhole cover

1999-10-06

2000-07-25

Clark, Doris

Building units and construction elements

Prefabricated unit

Underground service vault

2502

Patent

active

D04286588

REFERENCES:
patent: 166574 (1875-08-01), Wilbur
patent: 3289556 (1966-12-01), Russell
patent: 3618275 (1971-11-01), Ance
patent: 4662777 (1987-05-01), Newton
patent: 5123776 (1992-06-01), Lang et al.
patent: 5378078 (1995-01-01), Lewis et al.
patent: 5470172 (1995-11-01), Wiedrich
patent: 5529431 (1996-06-01), Walsh

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