Hydraulic step

Details Hydraulic step Hydraulic step

1991-10-11

1993-11-23

Word, A. Hugo

Building units and construction elements

Stair, ladder, scaffold, or similar support

Stepped

Patent

active

D03416658

REFERENCES:
patent: D200300 (1965-02-01), Struben
patent: D223087 (1972-03-01), Hinman
patent: 1555103 (1925-09-01), Christian
patent: 1917011 (1933-07-01), Bird
patent: 2772392 (1961-02-01), Kurvers
patent: 3566991 (1971-03-01), Proulx
patent: 4262777 (1981-04-01), Christopher
patent: 4488326 (1984-12-01), Cherry
patent: 4867277 (1989-09-01), Sloan

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