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发明名称
ROTARY HEAD
摘要
申请公布号
GB8517815(D0)
申请公布日期
1985.08.21
申请号
GB19850017815
申请日期
1985.07.15
申请人
LAM, M L
发明人
分类号
E21B3/00;E21B3/02;E21B7/00;E21B7/20;E21B21/00
主分类号
E21B3/00
代理机构
代理人
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