Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1982-09-22
1984-10-02
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D02757982
REFERENCES:
patent: D179748 (1957-02-01), Tunstead
patent: 2638260 (1953-05-01), Skolmen et al.
patent: 3498410 (1970-03-01), Storch
patent: 3804200 (1974-04-01), Sandberg
Ludwig Vernon L.
Ruda Jerome
Gust George A.
Harris Manufacturing Corporation
Word A. Hugo
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