Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1973-08-15
1977-04-19
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D2599
Patent
active
D02440938
REFERENCES:
patent: D148385 (1948-01-01), Paulus
patent: 3497877 (1970-03-01), Diemond et al.
Toys & Novelties, Jan. 1970, p. 82, ladder at top of page.
Hauke Robert C.
Vinyl-Fab Industries
Word A. Hugo
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