Building units and construction elements – Prefabricated unit – Underground service vault
Patent
1991-06-14
1994-03-01
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Underground service vault
Patent
active
D03448061
REFERENCES:
patent: 145184 (1873-12-01), Hyatt
patent: 503689 (1893-08-01), Walker
patent: 1242446 (1976-11-01), McNabb
patent: 2174989 (1939-10-01), Lyons
patent: 3103996 (1963-09-01), Wyatt, Jr.
patent: 4250671 (1981-02-01), Hirsch et al.
Bender S. Michael
Clark Doris
Word A. Hugo
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