Building units and construction elements – Structure – Circular or oval in plan
Patent
1991-03-18
1993-12-14
Word, A. Hugo
Building units and construction elements
Structure
Circular or oval in plan
D25 18
Patent
active
D03423239
REFERENCES:
patent: D234132 (1975-01-01), Varian
patent: D239278 (1976-03-01), Coperthwaite
patent: 2166577 (1939-07-01), Beckius
patent: 4015381 (1977-04-01), Schmidt
patent: 4365455 (1982-12-01), Braine
Solar Energy and Building by S. V. Szokolay, .COPYRGT.1975, p. 93, Delaware House.
Coles Doris V.
Word A. Hugo
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