Building units and construction elements – Prefabricated unit – Underground service vault
Patent
1988-11-09
1991-09-24
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Underground service vault
Patent
active
D03202810
REFERENCES:
patent: 2931323 (1960-04-01), Shaver et al.
patent: 2997932 (1961-08-01), Taylor
patent: 4566483 (1986-01-01), Ditcher
Clark Doris
Universal Valve Co. Inc.
Word A. Hugo
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