Cement retainer,申请号US19430497936-传众专利搜索

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发明名称	Cement retainer
摘要
申请公布号	US2421399(A)	申请公布日期	1947.06.03
申请号	US19430497936	申请日期	1943.08.09
申请人	DAVIDSON	发明人	WILSON MILO C.;DAVIDSON VERNON D.
分类号	E21B33/134	主分类号	E21B33/134
代理机构		代理人
主权项
地址

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