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US4798969A
(en)
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Power feed system in transmission line between terminals of three-terminal station
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BE539579A
(cs)
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CH439408A
(fr)
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Installation de séléction d'un central de télécommunication automatique
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EP0176646A1
(fr)
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Circuit d'interface de ligne
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CH286316A
(fr)
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Poste d'itinéraires à enclenchements électriques avec blocs de route pour la commande du trafic ferroviaire.
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BE507791A
(cs)
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US806950A
(en)
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Selective system for party-line telephones.
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US1147636A
(en)
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Telegraph-repeater.
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AR008488A1
(es)
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Circuito de conexion de usuario para la conexion de una linea de usuario analogica a una central de telecomunicaciones multiplex temporal digital
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BE473959A
(cs)
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US1053899A
(en)
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Train-stop system.
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SU91592A1
(ru)
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Устройство дл автоматической переездной сигнализации
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US1340197A
(en)
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System for recording electrical phenomena
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BE524322A
(cs)
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BE529013A
(cs)
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SU11394A1
(ru)
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Устройство дл однопроводной блокировочной сигнализации на посто нном токе дл однопутных железных дорог
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BE410986A
(cs)
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DE236610C
(cs)
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US837396A
(en)
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Electric controlling system.
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RU2173275C2
(ru)
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Устройство защиты рельсовых цепей
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US906800A
(en)
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Lock and block signal system.
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BE732112A
(cs)
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EP4500565A1
(fr)
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Contacteur bidirectionnel double pole à double coupure à champs magnétiques inversés
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US587433A
(en)
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Mortimer dtt perow |
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KR810000492Y1
(ko)
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에이형 자동 교환기의 스위치 시험기
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