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FR502421A
(en)
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Telephone transmitter
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DK23070C
(en)
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Apparatus for placing on telephone telephones to prevent the transmission of infection.
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DK22002C
(en)
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Apparatus for Preventing the Transmission of Infection by Telephoning.
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DK22107C
(en)
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System for Transmission of Electrical Impulses.
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DK32769C
(en)
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Telephone system with Group selector setting.
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DK33623C
(en)
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Device for Multiplex Telephony with High Frequency Drum.
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AT89732B
(en)
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Telephone switching system.
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FR506293A
(en)
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Telephone system
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FR509020A
(en)
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Telephone system
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CH80754A
(en)
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Self-collecting telephone station
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FR490806A
(en)
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Receiver for telephones and microtelephones
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FR505646A
(en)
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Transmission system for combined telephone and telegraph services
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FR498969A
(en)
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Improvements to automatic telephone networks
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FR499818A
(en)
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Improvements to automatic telephone networks
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DK21931C
(en)
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Automatic Telephone System.
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DK19139C
(en)
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Device for Checking the Number of Phone Calls.
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CA186667A
(en)
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Telephone device
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DK26495C
(en)
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Apparatus for Preventing Theft of Outerwear.
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DK36311C
(en)
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Device for automatic telephone systems.
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DK36348C
(en)
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Device for automatic telephone systems.
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DK36536C
(en)
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Device for automatic telephone systems.
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DK32541C
(en)
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Device for automatic telephone systems.
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DK33042C
(en)
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Device at semi-automatic Telephone exchanges.
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DK22475C
(en)
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Apparatus for Laying Potatoes.
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DK20387C
(en)
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Apparatus for the automatic transmission of telegraph signals.
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