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发明名称
Improvements in or relating to instruction devices
摘要
申请公布号
GB968601(A)
申请公布日期
1964.09.02
申请号
GB19610016239
申请日期
1961.05.04
申请人
NATIONAL RESEARCH DEVELOPMENT CORPORATION
发明人
NEWMAN EDWARD ARTHUR;SCANTLEBURY ROGER ANTHONY;LONGDEN MAUREEN
分类号
G09B7/08
主分类号
G09B7/08
代理机构
代理人
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