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经营范围
发明名称
TEACHING AID
摘要
申请公布号
GB1487574(A)
申请公布日期
1977.10.05
申请号
GB19740029216
申请日期
1975.05.15
申请人
KONWERSKI T
发明人
分类号
G01D5/22;G09B23/10;G09B23/18;(IPC1-7):G09B9/00;G01B7/30
主分类号
G01D5/22
代理机构
代理人
主权项
地址
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