Building units and construction elements – Structure
Patent
1997-07-28
1999-03-16
Clark, Doris
Building units and construction elements
Structure
D25199, 2503
Patent
active
D04069021
REFERENCES:
patent: D356163 (1995-03-01), Ryan
patent: 2161176 (1939-06-01), Leisner
patent: 4564313 (1986-01-01), Niswander et al.
patent: 4587684 (1986-05-01), Miller
patent: 4797030 (1989-01-01), Lockwood
Clark Doris
Con/Span Bridge Systems Inc.
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