Educational mathematical game apparatus
United States Patent 2769640
US Patent References:
/0088421.html
- - 0088421
/1246152.html
- - 1246152
Educational device
- - 1400887
Mathematical game
- - 1402807
Card game
- - 1415019
/0088421.html
- - 0088421
/1246152.html
- - 1246152
Educational device
- - 1400887
Mathematical game
- - 1402807
Card game
- - 1415019
Inventors:
Elder, Ruth B.
Publication Date:
11/06/1956
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Export Citation:
Assignee:
Elder, Ruth B.
Primary Class:
Other Classes:
434/209
International Classes:
A63F3/04; G09B19/02