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发明名称
EDUCATIONAL DEVICE
摘要
申请公布号
US3513568(A)
申请公布日期
1970.05.26
申请号
USD3513568
申请日期
1967.08.28
申请人
EMIR H. SHUFORD JR.;HERMAN EDWARD MASSENGILL JR.
发明人
EMIR H. SHUFORD JR.;HERMAN EDWARD MASSENGILL JR.
分类号
G09B3/06;(IPC1-7):C09B1/22
主分类号
G09B3/06
代理机构
代理人
主权项
地址
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