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经营范围
发明名称
Gaseous conduction apparatus
摘要
申请公布号
US1821242(A)
申请公布日期
1931.09.01
申请号
US19280300573
申请日期
1928.08.18
申请人
OLD COLONY TRUST COMPANY
发明人
SPENCER PERCY L.
分类号
H01J9/385
主分类号
H01J9/385
代理机构
代理人
主权项
地址
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