Security well cover

Details Security well cover Security well cover

1993-04-05

1995-07-25

Clark, Doris

Building units and construction elements

Prefabricated unit

Closure

D25 53

Patent

active

D03606996

REFERENCES:
patent: 2237564 (1941-04-01), Keyes
patent: 3046613 (1962-07-01), Smith

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