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BE464330A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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US1555952A
(en)
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Automatic telephone system
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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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US1355594A
(en)
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Telephone-exchange system
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US1139906A
(en)
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Telephone-exchange system.
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CH299886A
(fr)
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Dispositif de réception de signaux pour installation de télécommunication.
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BE347734A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE469508A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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US866266A
(en)
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Telephone system.
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BE531767A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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CH96100A
(fr)
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Installation pour bureau central manuel téléphonique.
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BE417423A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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CH102155A
(fr)
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Installation pour bureau central téléphonique.
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BE482011A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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GB191415338A
(en)
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Improvements in or relating to Telephone System.
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BE488676A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE354594A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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GB221289A
(en)
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Improvements in automatic telephone switching systems
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GB191329883A
(en)
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Improvements in Automatic Selecting Devices for Telephone Systems.
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BE468894A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE485314A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE528427A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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BE383771A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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GB191121259A
(en)
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Improvements in Switching Apparatus for Interconnecting the Lines of an Automatic Telephone System.
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BE440831A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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