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经营范围
发明名称
TEACHING SYSTEM
摘要
申请公布号
US3510963(A)
申请公布日期
1970.05.12
申请号
USD3510963
申请日期
1968.08.28
申请人
HICKOK TEACHING SYSTEMS INC.
发明人
PAUL B. ZBAR;HOWARD BRUCE BOAL
分类号
G09B23/18;(IPC1-7):G09B23/18;H02B1/04
主分类号
G09B23/18
代理机构
代理人
主权项
地址
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