Lightweight trench box

Details Lightweight trench box Lightweight trench box

1977-08-29

1979-09-18

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

D25 1, D25 61, D25 66, D2599

Patent

active

D02529505

REFERENCES:
patent: 2188077 (1940-01-01), Dowd
patent: 3335573 (1967-08-01), Ward
patent: 4056940 (1977-11-01), Fisher
patent: 4114383 (1978-09-01), Nieber

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