Building units and construction elements – Prefabricated unit – Closure
Patent
1976-05-20
1977-08-02
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
D2502
Patent
active
D02452669
REFERENCES:
patent: 3092170 (1963-06-01), Ellis
patent: 3527283 (1970-09-01), Butler et al.
patent: 3703061 (1972-11-01), Holland et al.
patent: 3941180 (1976-03-01), Thill
patent: 3980123 (1976-09-01), Vago
Saffrey Roy H.
Word A. Hugo
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