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发明名称
DRILLING BIT
摘要
申请公布号
JPS60115792(A)
申请公布日期
1985.06.22
申请号
JP19830222236
申请日期
1983.11.28
申请人
NIHON CONCRETE KOGYO KK;ASAHI KASEI KOGYO KK
发明人
HAYAKAWA TOMOYUKI;YANAJIMA IKUO;YOSHIDA SHIGERU;SHISHIDO TOMIO
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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