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US2766328A
(en)
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Device for the erasure of recordings on magnetic sound carriers in the form of discsor endless tapes
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GB784127A
(en)
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Improvements in or relating to apparatus for generating coded patterns of electric pulses
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BE514663A
(enrdf_load_html_response)
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DE725127C
(de)
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Anordnung zur selbsttaetigen Aufzeichnung und Wiedergabe von Fernsprechgespraechen
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US1983759A
(en)
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Automatic selecting and distributing system for radio reception
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GB1254258A
(en)
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A circuit arrangement including a relaxation oscillator for alternately providing ringing-tone and supervisory signals to subscriber stations
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DE2601892A1
(de)
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Elektronic - heim center
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US2134168A
(en)
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Pay station
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DE2830241A1
(de)
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An ein telefon oder eine telefonanlage angeschlossene einrichtung
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US1585770A
(en)
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Method and means fob selecting balancing networks |
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US1823944A
(en)
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Time recording
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US586685A
(en)
|
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Telephone-switchboard |
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DE335821C
(de)
|
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Schaltungsanordnung fuer den Anruf bei Hochfrequenz-Mehrfach-Fernsprechverbindungen
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US1116541A
(en)
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Telephone-exchange system.
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GB407808A
(en)
|
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Improvements in or relating to telephone instrument circuits
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Gardiol et al.
|
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SALVAN: CRADLE OF WIRELESS. |
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US2586213A
(en)
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Selective telephonic music distributing system and apparatus
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US1557247A
(en)
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Combined telegraph relay and telephone
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Jewett
|
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The social implications of scientific research in electrical communication |
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US1835737A
(en)
|
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Electrical recorder
|
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US1286966A
(en)
|
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Telephone-meter-service system.
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SU508238A3
(ru)
|
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Система генерации монетных импульсов дл самокассирующего телефонного аппарата
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US1409898A
(en)
|
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Automobile signal
|
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DE648349C
(de)
|
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Schaltungsanordnung fuer Fernmelde-, insbesondere Fernsprechanlagen mit mehreren in Reihe liegenden AEmtern
|
|
GB178141A
(en)
|
|
Improvements in automatic telephone pay station
|