Устройство для исследования кривой затухания звука (эхо),申请号SUD21263-传众专利搜索

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发明名称	Устройство для исследования кривой затухания звука (эхо)
摘要
申请公布号	SU21263(A1)	申请公布日期	1931.07.31
申请号	SUD21263	申请日期	1930.05.13
申请人	DREJZEN I.G.	发明人	DREJZEN I.G.
分类号	G01H17/00;H04R23/00	主分类号	G01H17/00
代理机构		代理人
主权项
地址

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