Title:
【考案の名称】単位ブロツクを用いた計算教習具
Document Type and Number:
Japanese Patent JPS59194771
Kind Code:
U
Inventors:
Yasuo Tanaka
Application Number:
JP8887483U
Publication Date:
December 25, 1984
Filing Date:
June 09, 1983
Export Citation:
International Classes:
G09B19/02; (IPC1-7): G09B19/02