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发明名称
PNEUMATIC PERCUSSIVE MACHINES
摘要
申请公布号
GB1472501(A)
申请公布日期
1977.05.04
申请号
GB19750001283
申请日期
1975.01.13
申请人
GIEN A;GIEN B
发明人
分类号
E21B4/14;(IPC1-7):B25D9/00
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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