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发明名称
SEALED UNIT OF ROCK ROLLER BIT SUPPORT
摘要
申请公布号
SU597805(A1)
申请公布日期
1978.03.15
申请号
SU19752188928
申请日期
1975.11.17
申请人
VNII BUROVOJ TEKHNIKI
发明人
BRAZHENTSEV VLADIMIR P,SU;KONSTANTINOV LEONID P,SU
分类号
(IPC1-7):E21B9/10
主分类号
(IPC1-7):E21B9/10
代理机构
代理人
主权项
地址
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