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发明名称
Educational device
摘要
申请公布号
US2725644(A)
申请公布日期
1955.12.06
申请号
US19520321986
申请日期
1952.11.22
申请人
WADE FRANCIS A;WILLIAM METZNER
发明人
WADE FRANCIS A.;METZNER WILLIAM
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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