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发明名称
Improvements in or relating to rotary earth-boring apparatus
摘要
申请公布号
GB364677(A)
申请公布日期
1932.01.11
申请号
GB19300030291
申请日期
1930.10.09
申请人
WILLIAM RICHARD MACDONALD
发明人
分类号
E21B21/00
主分类号
E21B21/00
代理机构
代理人
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