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发明名称
DIDACTIC DEVICE TO IMPROVE PENMANSHIP AND DRAWING SKILLS
摘要
申请公布号
EP0042487(B1)
申请公布日期
1986.09.24
申请号
EP19810103644
申请日期
1981.05.12
申请人
TEXAS INSTRUMENTS INCORPORATED
发明人
SCOTT, WARNER C.;WIGGINS, RICHARD H.
分类号
G09B5/06;G06Q50/00;G09B5/02;G09B7/02;G09B11/00;(IPC1-7):G09B11/00;G10L9/18;G06F15/20
主分类号
G09B5/06
代理机构
代理人
主权项
地址
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