Manhole cover pick hole plug

Details Manhole cover pick hole plug Manhole cover pick hole plug

1995-02-08

1996-12-17

Clark, Doris

Building units and construction elements

Prefabricated unit

Underground service vault

Patent

active

D03766543

REFERENCES:
patent: D219647 (1971-01-01), Handley et al.
patent: 4828274 (1989-05-01), Stannard
patent: 5324135 (1994-06-01), Smith

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