DK13495C
(en)
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Connection device for Telephone Dictation Systems.
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AT81614B
(en)
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Telephone system.
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DK14160C
(en)
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Connection device for automatic Telephone Stations.
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DK17180C
(en)
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Device for House Telephone Systems.
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DK16790C
(en)
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ATM for Telephone Devices.
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DK17025C
(en)
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Connecting device for semi-automatic Telephone systems.
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DK17874C
(en)
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Connecting device for semi-automatic Telephone systems.
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DK33751C
(en)
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Line amplifier device for Telephone cables.
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FR414964A
(en)
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Telephone system
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FR421902A
(en)
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Telephone system
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FR422677A
(en)
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Telephone system
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FR422937A
(en)
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Telephone system
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AT48831B
(en)
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Telephone.
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DK12932C
(en)
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Device for Registering the Length of Telephone Calls.
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DK20429C
(en)
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Device by Telephone Exchange Systems.
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DK20519C
(en)
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Device by Telephone Exchange Systems.
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DK18827C
(en)
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Circuit Device for Telephone Systems.
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DK14903C
(en)
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Sound signaling device for Railways.
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ES51258A1
(en)
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Communication device for automatic telephone installations.
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DK18956C
(en)
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Device for Microphones.
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FR417146A
(en)
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Automatic telephone system
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FR415536A
(en)
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Automatic telephone system
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CH53341A
(en)
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Automatic telephone system
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CH53855A
(en)
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Automatic telephone system
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CH56280A
(en)
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Automatic telephone system
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