Building units and construction elements – Prefabricated unit – Underground service vault
Patent
1992-09-25
1994-10-18
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Underground service vault
Patent
active
D03516695
REFERENCES:
patent: D306482 (1990-03-01), Milo
patent: D319883 (1991-09-01), Pettesch et al.
patent: 2004335 (1935-06-01), Merriman
patent: 3331295 (1967-07-01), Sorrell
patent: 4637752 (1987-01-01), Centa
patent: 4793387 (1988-12-01), Le Blanc et al.
3-D Composites Limited
Clark Doris
Word A. Hugo
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