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发明名称
Dust collecting device
摘要
申请公布号
US2149348(A)
申请公布日期
1939.03.07
申请号
US19370146730
申请日期
1937.06.07
申请人
THE KADCO CORPORATION
发明人
KELLEY GEORGE S.
分类号
E21B21/015
主分类号
E21B21/015
代理机构
代理人
主权项
地址
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