US2371291A
(en)
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Transmission system |
EP0072721B1
(fr)
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Système de localisation de boucles et d'ouvertures dans une ligne bifilaire
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BE393124A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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US3395255A
(en)
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Loudspeaking telephone
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US1970423A
(en)
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Signaling system
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FR2582169A1
(fr)
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Appareil amplificateur
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FR2589648A1
(fr)
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Circuit amplificateur a transistor a effet de champ
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US1950123A
(en)
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Automatic selection of receiving channels
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FR2472317A1
(fr)
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Reseau de parole actif pour un poste telephonique
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US1665698A
(en)
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Electric-current transmission
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BE440098A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE480506A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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US1818463A
(en)
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Zero correcting circuit
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US1047956A
(en)
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System for amplifying electric-current variations.
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FR2489632A1
(fr)
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Perfectionnement aux appareils telephoniques a haut-parleur
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BE473847A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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CH419235A
(fr)
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Circuit interrupteur électronique
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BE540651A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE389548A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE476280A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE515972A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE497364A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE429572A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE438657A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE379046A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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