Title:
Roller board device
Document Type and Number:
United States Patent 2829892

Inventors:
Ludwig, Frederic G.
Publication Date:
04/08/1958
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Assignee:
Ludwig, Frederic G.
Primary Class:
482/146
International Classes:
A63B22/16; A63B21/055; A63B22/00; A63B21/02
US Patent References:
1427790Toy
2250563Spool
Foreign References:
FR1098795A




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