Stackable step

Details Stackable step Stackable step

1998-12-18

1999-09-14

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

2504

Patent

active

D04139895

REFERENCES:
patent: D244494 (1977-05-01), Dottinger
patent: D375290 (1996-11-01), Hall
patent: 5029671 (1991-07-01), Larson
patent: 5154678 (1992-10-01), Adamczyk et al.
patent: 5318489 (1994-06-01), Irwin
Brochure on Shure-Step of Crest-Step-On, Inc., undated, but believed to be 1997.

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