Step unit for a modular spiral staircase

Details Step unit for a modular spiral staircase Step unit for a modular spiral staircase

1997-10-22

1998-09-08

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

2504

Patent

active

D03980634

REFERENCES:
patent: D225981 (1973-01-01), Brown
patent: D273231 (1984-03-01), Suckno
patent: 4587780 (1986-05-01), Rorke

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