Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1987-09-24
1990-09-25
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03108848
REFERENCES:
patent: D300252 (1989-03-01), Schmitt
patent: 2930442 (1960-03-01), Carter
Heald Edward E.
King Dale R.
Patton Russell S.
Clark Doris
R. D. Werner Co., Inc.
Slough J. Helen
Word A. Hugo
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