Building units and construction elements – Stair – ladder – scaffold – or similar support – Stepped
Patent
1990-08-30
1992-12-15
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Stepped
D 6350
Patent
active
D03318087
REFERENCES:
patent: D157436 (1950-02-01), Rogero
patent: D173804 (1955-01-01), Goldman et al.
patent: D240220 (1976-06-01), Meyer
patent: D297790 (1988-09-01), Melvin
patent: D307800 (1990-05-01), Hradisky
patent: 2666210 (1954-01-01), Wiley
patent: 3530954 (1970-09-01), Schmidt
patent: 3650351 (1972-03-01), Schmidt
Marshall Dennis G.
Paul Kenneth R.
Clark Doris
Word A. Hugo
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