Preset type telephone dialer with pulse generating transformers,申请号US19480039015-传众专利搜索

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发明名称	Preset type telephone dialer with pulse generating transformers
摘要
申请公布号	US2499606(A)	申请公布日期	1950.03.07
申请号	US19480039015	申请日期	1948.07.16
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	PARKINSON DAVID B.
分类号	H04M1/272	主分类号	H04M1/272
代理机构		代理人
主权项
地址

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