Building units and construction elements – Stair – ladder – scaffold – or similar support – Scaffold
Patent
1997-05-23
1999-01-05
Clark, Doris
Building units and construction elements
Stair, ladder, scaffold, or similar support
Scaffold
2502
Patent
active
D04037839
REFERENCES:
patent: D208630 (1967-09-01), Coblentz
patent: 5588500 (1996-12-01), Yonahara
Clark Doris
Sanritsu Giken Kogyo Kabushiki-Kaisya
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