FR2502373A1
(fr )
1982-09-24
Generateur de son audible piezo-electrique
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CH631034A5
(en )
1982-07-15
Modulation circuit
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CH120393A
(fr )
1927-08-01
Procédé pour passer d'une fréquence à l'autre dans des installations de signalisation à ondes porteuses, utilisant des dispositifs à décharge électronique.
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