Spiral stairway

Details Spiral stairway Spiral stairway

1981-09-08

1984-03-27

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Patent

active

D02732319

REFERENCES:
patent: 3513547 (1970-05-01), Suckno
Sweet's Catalog File Products for General Building, 1981, section 5.12 a/Ame, p. 4, item #64AW(Allwood), section 5.12 a/Cu, p. 3, photograph B.

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