Building units and construction elements – Structure – Four or more levels
Patent
1999-02-23
2000-12-26
Clark, Doris
Building units and construction elements
Structure
Four or more levels
2503
Patent
active
D04356667
REFERENCES:
patent: D180686 (1957-07-01), Everett
patent: 3217459 (1965-11-01), Meyer
patent: 4173853 (1979-11-01), Logan
Clark Doris
Larson James E.
LandOfFree
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