Manhole cover

Details Manhole cover Manhole cover

1999-10-06

2000-08-01

Clark, Doris

Building units and construction elements

Prefabricated unit

Underground service vault

2502

Patent

active

D04289994

REFERENCES:
patent: 166574 (1875-08-01), Wilbur
patent: D225460 (1972-12-01), Altobello
patent: 1799489 (1931-07-01), West
patent: 4662777 (1987-05-01), Newton
patent: 5123776 (1992-06-01), Lang et al.
patent: 5312202 (1972-12-01), Newton
patent: 5378078 (1995-01-01), Lewis et al.
patent: 5529431 (1996-06-01), Walsh

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