Method of making one-piece hollow doorknobs,申请号US19490093524-传众专利搜索

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发明名称	Method of making one-piece hollow doorknobs
摘要
申请公布号	US2688297(A)	申请公布日期	1954.09.07
申请号	US19490093524	申请日期	1949.05.16
申请人	TUBING SEAL CAP, INC.	发明人	LIVERMONT FRANK W.;COLLINS HARRY E.;GRESHAM WILLIAM F.
分类号	B21D26/02	主分类号	B21D26/02
代理机构		代理人
主权项
地址

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