Education and demonstration – Mathematics – Arithmetic
Patent
1985-10-28
1987-07-28
Grieb, William H.
Education and demonstration
Mathematics
Arithmetic
434175, G09B 114, G09B 1902
Patent
active
046829555
ABSTRACT:
An educational toy comprises a body having a peripheral vertical wall, a guide plate secured on the body and having a plurality of radial cutouts to be passages, a connecting passage formed between the vertical wall and the guide plate to communicate with the cutouts, and a plurality of slider pieces which may be moved along the radial cutouts and the connecting passage. The slider pieces are put in different colors to enjoy learning simple calculation. The toy is applicable to a picture book with some character and sentences.
REFERENCES:
patent: 1218993 (1917-03-01), Fox
patent: 1240556 (1917-09-01), Fox
patent: 2917325 (1959-12-01), Sines
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