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经营范围
发明名称
PERFECCIONAMIENTOS EN INSTALACIONES DE ENSENANZA.
摘要
申请公布号
ES373181(A1)
申请公布日期
1972.01.16
申请号
ES19810003731
申请日期
1969.11.05
申请人
WESTFALISCHE BERGGEWERKSCHAFTSKASSE
发明人
分类号
G09B7/073;(IPC1-7):09B/
主分类号
G09B7/073
代理机构
代理人
主权项
地址
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