Tree step

Details Tree step Tree step

1987-07-16

1989-08-29

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

182 92

Patent

active

D03031551

REFERENCES:
patent: 1342626 (1920-06-01), Fronk
patent: 1716826 (1929-06-01), Master
patent: 4309263 (1982-01-01), Boyd
patent: 4422527 (1983-12-01), Schultz et al.
patent: 4620610 (1986-11-01), Southard

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