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BE449804A
(fr )
1943-04-30
Système de télécommunication pour l'etablissement de connescions
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BE454860A
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FR2510849A1
(fr )
1983-02-04
Dispositif de saisie des informations de numerotation d'un poste telephonique
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BE430357A
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CH207617A
(fr )
1939-11-15
Dispositif répéteur d'impulsions pour installations téléphoniques ou similaires.