File sharpening method and apparatus,申请号US19300489786-传众专利搜索

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发明名称	File sharpening method and apparatus
摘要
申请公布号	US1907196(A)	申请公布日期	1933.05.02
申请号	US19300489786	申请日期	1930.10.20
申请人	AITKEN EARLE M	发明人	AITKEN EARLE M.
分类号	B24C1/02	主分类号	B24C1/02
代理机构		代理人
主权项
地址

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