Building units and construction elements – Stair – ladder – scaffold – or similar support – Element or attachment
Patent
1991-07-12
1993-10-12
Word, A. Hugo
Building units and construction elements
Stair, ladder, scaffold, or similar support
Element or attachment
Patent
active
D03402916
REFERENCES:
patent: D212471 (1968-10-01), Wood, Sr.
patent: D273996 (1984-05-01), Rasler
patent: D284513 (1986-07-01), Dyer
patent: D307187 (1990-04-01), Schaf
patent: 2051060 (1936-08-01), Soman
patent: 2930442 (1960-03-01), Carter
patent: 3182749 (1965-05-01), Girardello
patent: 3829051 (1974-08-01), Emmons
patent: 4862994 (1989-09-01), Hughes, Sr.
Bartnicki Frederick J.
Beggs Robert D.
MacGregor Francis W.
Werner Donald M.
Clark Doris
R. D. Werner Co., Inc.
Schwartz Ansel M.
Word A. Hugo
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