Ring for a manhole cover

Details Ring for a manhole cover Ring for a manhole cover

1988-10-12

1991-09-10

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Underground service vault

Patent

active

D03198839

REFERENCES:
patent: D247254 (1978-02-01), Brown et al.
patent: 3858998 (1975-01-01), Larson et al.
patent: 4015373 (1977-04-01), Boissier
patent: 4121390 (1978-10-01), Hall et al.
patent: 4203686 (1980-05-01), Bowman

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