Improvements in or relating to teaching apparatus,申请号GB19490031334-传众专利搜索

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发明名称	Improvements in or relating to teaching apparatus
摘要
申请公布号	GB713731(A)	申请公布日期	1954.08.18
申请号	GB19490031334	申请日期	1949.12.06
申请人	WALTER ALFRED GORDON BASS	发明人
分类号	G09B23/04	主分类号	G09B23/04
代理机构		代理人
主权项
地址

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