Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1981-02-17
1983-11-22
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D2502
Patent
active
D02715244
REFERENCES:
patent: 3513547 (1970-05-01), Suckno
Sweet's Catalog File Products for General Building, 1981, Section 5.12a/AMe, p. 4, Item #64 AW (All Wood); Section 5.12a/Cu, p. 3, Photograph B.
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