Means for improving contact operation,申请号US19320593348-传众专利搜索

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发明名称	Means for improving contact operation
摘要
申请公布号	US1930627(A)	申请公布日期	1933.10.17
申请号	US19320593348	申请日期	1932.02.16
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	SHANCK ROY B.
分类号	H04L27/04	主分类号	H04L27/04
代理机构		代理人
主权项
地址

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