Stair tread surface

Details Stair tread surface Stair tread surface

1997-03-26

1999-10-12

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

Element or attachment

2504

Patent

active

D04152891

REFERENCES:
patent: D28351 (1898-03-01), Inglis
patent: 954967 (1910-04-01), Jacobs

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