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发明名称
Gluehkathode fuer elektrische Leuchtroehren, die zwei uebereinanderliegende Lagen verschiedener Erdalkalimetalloxyde aufweist
摘要
申请公布号
DE606407(C)
申请公布日期
1934.12.01
申请号
DE1933P068413D
申请日期
1933.10.31
申请人
PATENT-TREUHAND-GESELLSCHAFT FUER ELEKTRISCHE GLUEHLAMPEN M.B.H.
发明人
分类号
H01J61/067
主分类号
H01J61/067
代理机构
代理人
主权项
地址
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