Screwhead,申请号US19400320256-传众专利搜索

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发明名称	Screwhead
摘要
申请公布号	US2258326(A)	申请公布日期	1941.10.07
申请号	US19400320256	申请日期	1940.02.23
申请人	HOLT GRANT J	发明人	HOLT GRANT J.
分类号	F16B23/00	主分类号	F16B23/00
代理机构		代理人
主权项
地址

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