Spiral staircase

Details Spiral staircase Spiral staircase

1977-05-19

1979-05-08

Gandy, James M.

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

D25 69, D2502

Patent

active

D02518058

REFERENCES:
patent: 3418770 (1968-12-01), Allmand
patent: 3513547 (1970-05-01), Suckno
Sweet's Architectural Catalog 1976, vol. 3, Section 6.9/dr, rear page, Posts on Spiral Staircase, top of page.

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