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BE453730A
(https=)
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US1918043A
(en)
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System of communication by means of current impulses
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US1117297A
(en)
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Telephone-exchange system.
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US1650409A
(en)
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Automatic telephone system
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BE344464A
(https=)
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BE411648A
(https=)
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BE435598A
(https=)
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US1201600A
(en)
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Telephone trunking system.
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US1517381A
(en)
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System of telegraph distribution |
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EP0530098A1
(fr)
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Agencement et procédé de communication entre unités d'une installation de communication
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BE354594A
(https=)
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BE451446A
(https=)
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BE384554A
(https=)
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BE469154A
(https=)
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BE411026A
(https=)
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CH138731A
(fr)
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Connecteur pour installations téléphoniques automatiques et autres installations analogues.
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BE431226A
(https=)
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BE351681A
(https=)
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BE470530A
(https=)
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BE395663A
(https=)
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BE372105A
(https=)
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BE416698A
(https=)
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BE400690A
(https=)
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BE409407A
(https=)
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BE474794A
(https=)
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