Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1986-04-14
1989-03-21
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
Patent
active
D03003655
REFERENCES:
patent: 4023647 (1977-05-01), Confer
Schmitt Thomas J.
Wallick, Jr. Claude R.
Emerson Electric Co.
Word A. Hugo
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