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发明名称
Vacuum tube
摘要
申请公布号
US1759865(A)
申请公布日期
1930.05.27
申请号
US19270181027
申请日期
1927.04.05
申请人
PERRYMAN ELECTRIC CO., INC.
发明人
PERRYMAN GEORGE H.
分类号
H01J19/42
主分类号
H01J19/42
代理机构
代理人
主权项
地址
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