Walking beam head yoke,申请号US19280314118-传众专利搜索

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发明名称	Walking beam head yoke
摘要
申请公布号	US1834438(A)	申请公布日期	1931.12.01
申请号	US19280314118	申请日期	1928.10.22
申请人	TROUT WALTER C	发明人	TROUT WALTER C.
分类号	E21B1/04	主分类号	E21B1/04
代理机构		代理人
主权项
地址

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