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发明名称
摘要
申请公布号	US2899186(A)	申请公布日期	1959.08.11
申请号	USD2899186	申请日期
申请人		发明人
分类号	E21B43/243	主分类号	E21B43/243
代理机构		代理人
主权项
地址

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