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发明名称
Drop pit
摘要
申请公布号
US1802592(A)
申请公布日期
1931.04.28
申请号
US19300428866
申请日期
1930.02.17
申请人
WHITING CORPORATION
发明人
CHRISTIE HUGH K.
分类号
B61K5/00
主分类号
B61K5/00
代理机构
代理人
主权项
地址
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