Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1982-09-20
1984-09-04
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D02754223
REFERENCES:
patent: D248777 (1978-08-01), Spencer et al.
patent: 1599209 (1926-09-01), Cashman
patent: 4342374 (1982-08-01), Montana
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