Step riser

Details Step riser Step riser

1999-03-11

2000-05-09

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

2504

Patent

active

D04247078

REFERENCES:
patent: D279607 (1985-07-01), Rutter
patent: 4583334 (1986-04-01), Hubbard
patent: 4893442 (1990-01-01), Graham et al.

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