Switch cleaning device,申请号US19260140046-传众专利搜索

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发明名称	Switch cleaning device
摘要
申请公布号	US1840116(A)	申请公布日期	1932.01.05
申请号	US19260140046	申请日期	1926.10.07
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	LINTON GRANT;TOWNSEND JOHN R.
分类号	H04Q1/20	主分类号	H04Q1/20
代理机构		代理人
主权项
地址

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