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发明名称
Weight actuated flowing device
摘要
申请公布号
US2278420(A)
申请公布日期
1942.04.07
申请号
US19390308313
申请日期
1939.12.08
申请人
ALEXANDER BOYNTON
发明人
BOYNTON ALEXANDER
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
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