Building units and construction elements – Structure – Circular or oval in plan
Patent
1980-05-19
1982-10-19
Word, A. Hugo
Building units and construction elements
Structure
Circular or oval in plan
D25 1, D25 16, D2503
Patent
active
D02665921
REFERENCES:
patent: D231695 (1974-05-01), Dattner
patent: D242252 (1976-11-01), Elliott
patent: D245101 (1977-07-01), Spillman et al.
patent: 1431243 (1922-10-01), McKelv
E. F. Bavis & Associates, Inc.
Word A. Hugo
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