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DK22107C
(en)
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System for Transmission of Electrical Impulses.
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DK35237C
(en)
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Telephone system.
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DK22015C
(en)
|
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Telegraph.
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CH72118A
(en)
|
|
Telegraph system
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|
DK21931C
(en)
|
|
Automatic Telephone System.
|
|
FR23871E
(en)
|
|
Telegraph transmitter
|
|
DK21790C
(en)
|
|
Transmission of Electrical Impulses through High Capacity Circuits.
|
|
FR492767A
(en)
|
|
Telegraph transmitter
|
|
AT89309B
(en)
|
|
Telephone switching system.
|
|
DK23070C
(en)
|
|
Apparatus for placing on telephone telephones to prevent the transmission of infection.
|
|
FR477762A
(en)
|
|
Advanced telegraphy system
|
|
DK29070C
(en)
|
|
Submarine Listener.
|
|
DK19678C
(en)
|
|
Telephone system.
|
|
DK34223C
(en)
|
|
Device for Compensating Changes in the Electrical Characteristics of Multiple Transmission Circuits.
|
|
CA195359A
(en)
|
|
Telegraph system
|
|
CA193282A
(en)
|
|
Telegraph system
|
|
CA186428A
(en)
|
|
Telegraph system
|
|
CA186187A
(en)
|
|
Telegraph system
|
|
CH71723A
(en)
|
|
Transmission system
|
|
DK33290C
(en)
|
|
Telegraph receiver.
|
|
FR490940A
(en)
|
|
Telephone receiver
|
|
DK32311C
(en)
|
|
Electrical Signal System.
|
|
DK34827C
(en)
|
|
Electrical Signal System.
|
|
FR509020A
(en)
|
|
Telephone system
|
|
FR506293A
(en)
|
|
Telephone system
|