Manhole cover

Details Manhole cover Manhole cover

1987-05-11

1990-03-06

Word, A. Hugo

Building units and construction elements

Prefabricated unit

Underground service vault

Patent

active

D03064824

REFERENCES:
patent: 17341 (1890-09-01), McColley
patent: D27673 (1897-09-01), Greger
patent: 284203 (1883-09-01), Herr
patent: 3920347 (1975-11-01), Sauriol et al.
patent: 4523407 (1985-06-01), Miller

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