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发明名称
ROERHENGEANORDNING.
摘要
申请公布号
NO144431(C)
申请公布日期
1981.08.26
申请号
NO19740003454
申请日期
1974.09.25
申请人
PUTCH, SAMUEL WILLIAM,;NELSON, NORMAN ALLEN,
发明人
PUTCH, SAMUEL WILLIAM,
分类号
E21B33/04;E21B33/00;E21B33/043;(IPC1-7):E21B33/04
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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