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DK5002C
(en)
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Fine-grained Diaphragm for Reproduction and Transmission of Sound.
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DK23140C
(en)
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Device for amplification and reproduction of sound waves.
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DK5102C
(en)
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Telephone device with strong sound reproduction.
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CA77528A
(en)
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Diaphragm for reproducing and transmitting sound
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DK6894C
(en)
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Procedure for Drainage and Disintegration of Dune.
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CH25937A
(en)
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Telephone hearing tube
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DK242C
(en)
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Devices by Phonographs for Recording and Reproduction of Sound.
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DK298C
(en)
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Devices by Phonographs for Recording and Reproduction of Sound.
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CH25823A
(en)
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Write telegraph
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DK20601C
(en)
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Telephone or Microphone audio box for phonographic recording and reproduction of telephone messages.
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DK5359C
(en)
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Procedure and Device for the Manufacture of Cigarette Mouthpieces of Pap.
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FR340652A
(en)
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Receiver for audio phone
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FR340653A
(en)
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Receiver for audio phone
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DK5048C
(en)
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Procedure and Device for Propagation and Leaching of Mercury Cathodes under Uniform Conditions.
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DK10262C
(en)
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Device for Wireless Transmission of Sound Waves.
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FR330477A
(en)
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Development of combined telephone devices
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DK4980C
(en)
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Method of Making an Insulating Agent.
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DK5193C
(en)
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Procedure for the production of gas and coke.
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FR321530A
(en)
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Microphone
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CH26330A
(en)
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microphone
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CH24954A
(en)
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Recording diaphragm for phonographs and graphones
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FR334753A
(en)
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Diaphragm amplifier and tensioner for phonograph and graphophone
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CH24499A
(en)
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Receiver for phonographs and graphophones
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FR327907A
(en)
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Talking pendulum
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DK5024C
(en)
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Procedure for the manufacture of spiral tubes and the like.
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