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1989-12-06

1991-12-03

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Patent

active

D03221318

REFERENCES:
patent: 2044703 (1936-06-01), Kline
patent: 2632591 (1953-03-01), Loomis
patent: 3643448 (1972-02-01), Bower
patent: 4212564 (1980-07-01), Kay
patent: 4352597 (1982-10-01), Kay
patent: 4823910 (1989-04-01), Day
patent: 4890959 (1990-01-01), Robishaw et al.

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