Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1991-02-08
1993-03-23
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03342409
REFERENCES:
patent: D300252 (1989-03-01), Schmitt
patent: D310884 (1990-09-01), Patton et al.
patent: 2930442 (1960-03-01), Carter
Clark Doris
Emerson Electric Co.
Word A. Hugo
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