Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1990-10-19
1992-10-13
Burke, Wallace R.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03302601
REFERENCES:
patent: D213254 (1969-01-01), Hollingsworth
patent: D274945 (1984-07-01), Fitch
patent: D279606 (1985-07-01), Menans
patent: 2436337 (1948-02-01), Smith et al.
patent: 4771863 (1988-09-01), Stansberry
Baynham H.
Burke Wallace R.
Johnson Larry D.
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