Nonreadable carbon paper,申请号US19300463010-传众专利搜索

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发明名称	Nonreadable carbon paper
摘要
申请公布号	US1829250(A)	申请公布日期	1931.10.27
申请号	US19300463010	申请日期	1930.06.23
申请人	THE PROTECTU CORPORATION	发明人	WALKER CRAWFORD J.
分类号	B41M5/10	主分类号	B41M5/10
代理机构		代理人
主权项
地址

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