Portable seating bleacher

Details Portable seating bleacher Portable seating bleacher

1998-05-21

1999-11-23

Clark, Doris

Building units and construction elements

Stair, ladder, scaffold, or similar support

2504

Patent

active

D04170105

REFERENCES:
patent: D216787 (1970-03-01), Sorenson
patent: 3117350 (1964-01-01), Margadant
patent: 3451361 (1969-06-01), Sorenson

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