Building units and construction elements – Structure – Polygonal in plan
Patent
1997-07-28
1998-08-25
Clark, Doris
Building units and construction elements
Structure
Polygonal in plan
D25 1, 2503
Patent
active
D03974456
REFERENCES:
patent: D211239 (1968-06-01), Carter
patent: D275888 (1984-10-01), Lauer et al.
patent: 1806354 (1931-05-01), Lange
patent: 4672779 (1987-06-01), Boyd
patent: 4872470 (1989-10-01), Hayashida et al.
Thorbeck Duane
Tilsner Joel
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