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经营范围
发明名称
Electric resistance
摘要
申请公布号
US1947692(A)
申请公布日期
1934.02.20
申请号
US19300426434
申请日期
1930.02.06
申请人
ROBERT BEYER CORPORATION
发明人
BEYER ROBERT
分类号
H01B1/18
主分类号
H01B1/18
代理机构
代理人
主权项
地址
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