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发明名称
A rotary head
摘要
申请公布号
GB2169333(A)
申请公布日期
1986.07.09
申请号
GB19850017815
申请日期
1985.07.15
申请人
MING LUEN * LAM
发明人
MING LUEN * LAM
分类号
E21B3/00;E21B3/02;E21B7/00;E21B7/20;E21B21/00;(IPC1-7):E21B3/02;E21B21/12
主分类号
E21B3/00
代理机构
代理人
主权项
地址
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