Improvements in or relating to sound-proof doors,申请号GB19330028573-传众专利搜索

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发明名称	Improvements in or relating to sound-proof doors
摘要
申请公布号	GB410675(A)	申请公布日期	1934.05.24
申请号	GB19330028573	申请日期	1933.10.16
申请人	EMILE JEAN VAN DE VEN	发明人
分类号	E06B3/70	主分类号	E06B3/70
代理机构		代理人
主权项
地址

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