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发明名称
Circuit-changing device
摘要
申请公布号
US1842963(A)
申请公布日期
1932.01.26
申请号
US19270231368
申请日期
1927.11.05
申请人
GENERAL ELECTRIC COMPANY
发明人
DAY WINTERTON J.
分类号
F21V19/04
主分类号
F21V19/04
代理机构
代理人
主权项
地址
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