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发明名称
MULTI-SECTIONAL PERCUSSIVE DRILL BIT ASSEMBLY
摘要
申请公布号
HK1127107(A1)
申请公布日期
2012.09.21
申请号
HK20090106772
申请日期
2009.07.23
申请人
KEYSTONE AIR & DRILL SUPPLY CO.
发明人
WALKER, THOMAS, A.;MEANS, STEPHEN, R.;SMITH, RICHARD, K., JR.
分类号
E21B
主分类号
E21B
代理机构
代理人
主权项
地址
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