Rolling stair

Details Rolling stair Rolling stair

1998-06-26

1999-06-15

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

2504

Patent

active

D04110196

REFERENCES:
patent: D304499 (1989-11-01), Rogers et al.
patent: 2551345 (1951-05-01), Scott
patent: 2805703 (1957-09-01), Wise

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