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发明名称
EDUCATIONAL DEVICE
摘要
申请公布号
CA691280(A)
申请公布日期
1964.07.21
申请号
CAD691280
申请日期
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
WILLIAM R. UTTAL
分类号
主分类号
代理机构
代理人
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地址
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