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发明名称
EDUCATIONAL EQUIPMENT
摘要
申请公布号
GB1294673(A)
申请公布日期
1972.11.01
申请号
GB19690054338
申请日期
1969.11.05
申请人
WESTFALISCHE BERGGEWERKSCHAFTSKASSE
发明人
分类号
G09B7/073
主分类号
G09B7/073
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代理人
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