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发明名称
Production tester
摘要
申请公布号
US1921472(A)
申请公布日期
1933.08.08
申请号
US19300481439
申请日期
1930.09.12
申请人
MACREADY GEORGE A
发明人
MACREADY GEORGE A.
分类号
E21B49/08
主分类号
E21B49/08
代理机构
代理人
主权项
地址
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