CA399525A
(fr )
1941-09-23
Oscillateur a lampe a vide
CA397875A
(fr )
1941-07-08
Circuit de lampe a vide
CA394341A
(fr )
1941-01-28
Dispositif de lampe a vide
CA395774A
(fr )
1941-04-08
Dispositif de lampe a vide
CA399144A
(fr )
1941-09-09
Nettoyeur de tubes
CA399827A
(fr )
1941-10-07
Lampe diode oscillatrice
CA394306A
(fr )
1941-01-28
Lampe a electrons
CA398479A
(fr )
1941-08-05
Lampe a electrons
CA401016A
(fr )
1941-11-25
Lampe a electrons
CA394827A
(fr )
1941-02-25
Lampe de la radio
CA396127A
(fr )
1941-04-29
Fabrication de tubes
CA395831A
(fr )
1941-04-15
Fabrication de tubes
CA400223A
(fr )
1941-10-28
Deplaceur dans tuyaux
CA399710A
(fr )
1941-09-30
Cristallisateur a vide
CA394509A
(fr )
1941-02-11
Aspirateur
CA400072A
(fr )
1941-10-21
Aspirateur
CA400578A
(fr )
1941-11-11
Aspirateur
CA400846A
(fr )
1941-11-18
Aspirateur
CA395666A
(fr )
1941-04-01
Lampe de braun
CA396283A
(fr )
1941-05-06
Pompe a vide
CA388567A
(fr )
1940-05-07
Pousse-vide de lampe a vide
CA388658A
(fr )
1940-05-14
Pousse-vide de lampe a vide
CA397587A
(fr )
1941-07-01
Lampe a rayons-x
CA398430A
(fr )
1941-08-05
Appareil a faire le vide
CA394952A
(fr )
1941-03-04
Lampe photo-electrique