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CH395200A
(fr)
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Installation de sélection d'un central de télécommunication automatique
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BE464914A
(forum.php)
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US2598098A
(en)
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Telephone call distributing system
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US2733295A
(en)
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lomax |
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CH272954A
(fr)
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Installation téléphonique automatique.
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BE522048A
(forum.php)
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US2921980A
(en)
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Prepay postpay paystation telephone arrangement
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BE449804A
(fr)
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Système de télécommunication pour l'etablissement de connescions
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US3188396A
(en)
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Foreign exchange trunking
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US1855779A
(en)
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Telephone system
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US2955160A
(en)
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Telephone system
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US1677414A
(en)
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Automatic telephone system
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US2996582A
(en)
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Discriminating trunk circuit
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US1895113A
(en)
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Automatic telegraph switching system
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US2761905A
(en)
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Finder arrangements in telephone systems
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US1174434A
(en)
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Telephone pay-station.
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BE481263A
(forum.php)
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US4169221A
(en)
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Method and apparatus for testing a subscriber line group marker of a telephone central office cross bar switching device
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US2709719A
(en)
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Automatic telephone system employing rotary line switches for connecting calling lines to numerical switches
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BE476748A
(forum.php)
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US1395595A
(en)
|
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Telephone system
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BE446398A
(forum.php)
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BE489601A
(forum.php)
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BE336765A
(forum.php)
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BE351277A
(forum.php)
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