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摘要
申请公布号
DE2437103(C3)
申请公布日期
1978.05.24
申请号
DE19742437103
申请日期
1974.07.30
申请人
OTIS ENGINEERING CORP., DALLAS, TEX. (V.ST.A.)
发明人
SCHWEGMAN, HARRY E., DALLAS, TEX. (V.ST.A.)
分类号
E21B23/03;(IPC1-7):E21B23/02
主分类号
E21B23/03
代理机构
代理人
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