Title:
Educational game
United States Patent 3394471
US Patent References:
Device for teaching arithmetic
- - 2472439
Mnemotechnic device and method of operation thereof
- - 3190013
Device for teaching arithmetic
- - 2472439
Mnemotechnic device and method of operation thereof
- - 3190013
Inventors:
Holten, James G.
Publication Date:
07/30/1968
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
273/280, 273/291, 273/284, 434/157
International Classes:
A63F3/04; G09B19/06
Foreign References:
| CA491948A |