Grandstands
United States Patent 3289367

Inventors:
Charles, Mackintosh
Publication Date:
12/06/1966
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Assignee:
Charles, Mackintosh
Primary Class:
52/191
Other Classes:
108/92
International Classes:
E04H3/12; E04H3/10
US Patent References:
2206862Auxiliary stair tread
2297101Building structure
2584066Bleacher frame construction
2636225Steel deck grandstand