Coin controlled doorbell system,申请号US19330680704-传众专利搜索

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发明名称	Coin controlled doorbell system
摘要
申请公布号	US2073129(A)	申请公布日期	1937.03.09
申请号	US19330680704	申请日期	1933.07.17
申请人	CONANT WAIT;WAIT VALERIE B	发明人	WAIT CONANT;WAIT VALERIE B.
分类号	G07F17/00	主分类号	G07F17/00
代理机构		代理人
主权项
地址

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