Perfectionnements aux installations téléphoniques,申请号FRD774177-传众专利搜索

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发明名称	Perfectionnements aux installations téléphoniques
摘要
申请公布号	FR774177(A)	申请公布日期	1934.12.03
申请号	FRD774177	申请日期	1933.08.26
申请人		发明人	FRIEDLAENDER
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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