Building units and construction elements – Prefabricated unit – Closure
Patent
1986-05-20
1989-02-21
Word, A. Hugo
Building units and construction elements
Prefabricated unit
Closure
Patent
active
D02999617
REFERENCES:
patent: D211456 (1968-06-01), Anderson
patent: D213444 (1969-03-01), Helma
patent: D251741 (1979-05-01), Smallwood et al.
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