Building units and construction elements – Structure – Greenhouse
Patent
1986-09-17
1989-02-07
Word, A. Hugo
Building units and construction elements
Structure
Greenhouse
D25 18
Patent
active
D02997533
REFERENCES:
patent: D135758 (1943-06-01), Waterman
patent: D228452 (1973-09-01), Flickinger
patent: D244542 (1977-05-01), Obata
patent: 3028872 (1962-04-01), Cresswell
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