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发明名称
TEACHING APPARATUS
摘要
申请公布号
GB8527966(D0)
申请公布日期
1985.12.18
申请号
GB19850027966
申请日期
1985.11.13
申请人
BALL, R F
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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