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FR2479558A1
(fr )
1981-10-02
Tube a ondes progressives a cavites couplees et focalisation par aimants permanents alternes, et ensemble amplificateur comprenant un tel tube
EP0107522A1
(fr )
1984-05-02
Perfectionnement aux cathodes à chauffage direct
BE400556A
(fr )
1934-01-31
Appareil électrique, notamment appareil à rayons x
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FR2608829A1
(fr )
1988-06-24
Thermistance du type a coefficient de temperature positif et a grande resistance aux surtensions
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