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DK4886C
(en)
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Telephone cable with Paper and Air insulation.
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DK5032C
(en)
|
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Telephone cable with Paper and Air insulation.
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DK4542C
(en)
|
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Electrical Double cable with partial Air insulation.
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CH24500A
(en)
|
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Telephone cables with air insulation
|
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CH25347A
(en)
|
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Telephone cables with air insulation
|
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CH24701A
(en)
|
|
Cable duct
|
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CH26733A
(en)
|
|
Cable duct
|
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CH24700A
(en)
|
|
Cable duct element
|
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ES24674A1
(en)
|
|
Microphone improvements combined with electrical devices.
|
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DK7399C
(en)
|
|
Air-insulated Telephone and Telegraph Cable.
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DK4554C
(en)
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Device for telephone sets with the same cable for several subscribers.
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ES30227A2
(en)
|
|
An announcing device with movable advertisements.
|
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FR317622A
(en)
|
|
An insulator
|
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CH27420A
(en)
|
|
Intercom
|
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DK5102C
(en)
|
|
Telephone device with strong sound reproduction.
|
|
CH30269A
(en)
|
|
Telephone system with closed-circuit operation
|
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DK4890C
(en)
|
|
Electrical Cable.
|
|
CH26991A
(en)
|
|
Telephone system
|
|
ES30784A3
(en)
|
|
Improvements in electrical transformers.
|
|
CH30654A
(en)
|
|
Telephone system
|
|
CH31509A
(en)
|
|
Telephone system
|
|
FR321530A
(en)
|
|
Microphone
|
|
CH27601A
(en)
|
|
Self-collecting telephone station
|
|
CH31099A
(en)
|
|
Self-connecting telephone system
|
|
CH26330A
(en)
|
|
microphone
|