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经营范围
发明名称
Immersible electric heater
摘要
申请公布号
US3068339(A)
申请公布日期
1962.12.11
申请号
US19600055491
申请日期
1960.09.12
申请人
DE KAY ROBERT;CHORJEL CHARLES E
发明人
KAY ROBERT DE;CHORJEL CHARLES E.
分类号
E21B36/04;H05B3/78
主分类号
E21B36/04
代理机构
代理人
主权项
地址
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