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发明名称
Improvements in or relating to bore-hole grabs
摘要
申请公布号
GB838911(A)
申请公布日期
1960.06.22
申请号
GB19570030320
申请日期
1957.09.27
申请人
ROBERT HOCHSTRASSER
发明人
分类号
E02F3/47
主分类号
E02F3/47
代理机构
代理人
主权项
地址
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