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发明名称
Bohrhakenverriegelung
摘要
申请公布号
AT302219(B)
申请公布日期
1972.10.10
申请号
AT19700008779
申请日期
1970.09.29
申请人
DRESSER INDUSTRIES, INC.
发明人
分类号
B66C1/34;(IPC1-7):E21B19/04
主分类号
B66C1/34
代理机构
代理人
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