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发明名称
Lampe à gaz raréfié permettant l'enregistrement du son suivant le système à surface variable
摘要
申请公布号
FR710280(A)
申请公布日期
1931.08.20
申请号
FRD710280
申请日期
1931.01.26
申请人
发明人
LOVICHI ANTOINE-FRANCOIS
分类号
H01J17/40
主分类号
H01J17/40
代理机构
代理人
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地址
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