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经营范围
发明名称
TEACHING MACHINE
摘要
申请公布号
US3451142(A)
申请公布日期
1969.06.24
申请号
USD3451142
申请日期
1961.03.13
申请人
GRAFLEX INC.
发明人
RAYMOND H. HARTJEN
分类号
G09B3/04;(IPC1-7):G09B3/00;G09B7/00
主分类号
G09B3/04
代理机构
代理人
主权项
地址
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