Intercommunication system including a master station,申请号US19450599169-传众专利搜索

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发明名称	Intercommunication system including a master station
摘要
申请公布号	US2428072(A)	申请公布日期	1947.09.30
申请号	US19450599169	申请日期	1945.06.13
申请人	AUTOMATIC ELECTRIC LABORATORIES, INC.	发明人	GRAYBILL KENNETH WAYNE
分类号	H01H63/22;H04M9/00	主分类号	H01H63/22
代理机构		代理人
主权项
地址

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