Step for a portable riser assembly

Details Step for a portable riser assembly Step for a portable riser assembly

1992-01-30

1993-11-16

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

Patent

active

D03414310

REFERENCES:
patent: 1964660 (1934-06-01), Bozby
patent: 1985143 (1934-12-01), Buffaloe
patent: 2697931 (1954-12-01), Schill
patent: 3765509 (1973-10-01), Taylor
patent: 3851431 (1974-12-01), Klein

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