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发明名称
Core drill with clock operated photographic means for ascertaining dip
摘要
申请公布号
US1894996(A)
申请公布日期
1933.01.24
申请号
US19280271932
申请日期
1928.04.21
申请人
MACREADY GEORGE A
发明人
MACREADY GEORGE A.
分类号
E21B25/16;E21B47/026
主分类号
E21B25/16
代理机构
代理人
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