Folding stage riser

Details Folding stage riser Folding stage riser

1987-11-06

1990-04-10

Burke, Wallace R.

Building units and construction elements

Stair, ladder, scaffold, or similar support

Patent

active

D03071863

REFERENCES:
patent: D216787 (1970-03-01), Sorenson
patent: 3747706 (1973-07-01), Paine et al.
patent: 4011695 (1977-03-01), Simmons, Sr.

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