METHOD OF CONNECTING A STEEL BLANK TO A TUNGSTEN BIT BODY,申请号USD3471921-传众专利搜索

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发明名称	METHOD OF CONNECTING A STEEL BLANK TO A TUNGSTEN BIT BODY
摘要
申请公布号	US3471921(A)	申请公布日期	1969.10.14
申请号	USD3471921	申请日期	1966.11.16
申请人	SHELL OIL CO.	发明人	ROBIJN FEENSTRA
分类号	B23K35/30;C09J163/00;E21B10/46;(IPC1-7):B23K31/02;B21K5/02	主分类号	B23K35/30
代理机构		代理人
主权项
地址

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