Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1981-11-30
1984-02-28
Bullock, B. J.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
D 8394, D0699, D0808
Patent
active
D02728575
REFERENCES:
patent: 1374060 (1921-04-01), Chute
patent: 2100918 (1937-11-01), Ringman
patent: 3094304 (1963-06-01), Linder, Jr.
patent: 4143743 (1979-03-01), Larson
patent: 4164269 (1979-08-01), Jackson
Bullock B. J.
Rost Kyle W.
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