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US4211895A
(en)
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Electronic telephone system with time division multiplexed signalling
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SE179975C1
(enrdf_load_html_response)
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CH395200A
(fr)
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Installation de sélection d'un central de télécommunication automatique
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US1676742A
(en)
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Traffic-recording equipment for telephone systems
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DE1919585C3
(de)
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Schaltungsanordnung zum Anruf von mit Tonrufempfängern ausgerüsteten Teilnehmerstellen in Fernmelde-, insbesondere Fernsprechvermittlungsanlagen
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US2498700A
(en)
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Teleprinter exchange system
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US1105492A
(en)
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Telephone-exchange system.
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US2250101A
(en)
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Telephone system
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US2124913A
(en)
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Telephone system
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US1690210A
(en)
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Telephone system
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US1093525A
(en)
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Automatic telephone-exchange system.
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US2748193A
(en)
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Duplex signaling system
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US1889466A
(en)
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Telephone plant
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US981399A
(en)
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Telephone trunking system.
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US1895113A
(en)
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Automatic telegraph switching system
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US1849088A
(en)
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Telephone system
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US1107138A
(en)
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Automatic telephone-exchange system.
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US2847510A
(en)
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Drop-back type selector
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US3524944A
(en)
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Route and re-route search,busy signal and signal transmission in a multistage switching network
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DE1024123B
(de)
|
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Schaltungsanordnung fuer ein elektronisches Vermittlungssystem
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US1849087A
(en)
|
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Telephone system
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US2938944A
(en)
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Telegraph system
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US1557993A
(en)
|
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Automatic telephone-exchange system
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US1001070A
(en)
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Lock-out telephone system.
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US833297A
(en)
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Lock-out system for party-line telephones.
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