Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1987-11-19
1990-07-03
Word, Hugo A.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03090264
REFERENCES:
patent: 1352566 (1920-09-01), Voll
patent: 1398851 (1921-11-01), Garven
patent: 2419065 (1947-04-01), Fowler
patent: 3708080 (1973-01-01), Schlei
patent: 4194592 (1980-03-01), Evans
patent: 4280590 (1981-07-01), Polizzi
patent: 4369860 (1983-01-01), Beane
Harvey David H. C.
Menelaus Ian G.
Clark Doris
Stabilad Limited
Word Hugo A.
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