Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1988-09-02
1990-04-10
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03071871
REFERENCES:
patent: 1494107 (1924-05-01), Faulkner
patent: 2641511 (1953-06-01), McClure
patent: 2732264 (1956-01-01), Smith et al.
patent: 2806642 (1957-09-01), Miele
Clark Doris
Kearns Jerry T.
Word A. Hugo
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