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DK298C
(en)
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Devices by Phonographs for Recording and Reproduction of Sound.
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DK242C
(en)
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Devices by Phonographs for Recording and Reproduction of Sound.
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GB189424588A
(en)
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Improved Pedal-apparatus for Controlling the Recording and Reproducing Apparatus of Phonographs.
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FR343992A
(en)
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Improvements to recording and reproducing devices applicable to phonographs
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DK5002C
(en)
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Fine-grained Diaphragm for Reproduction and Transmission of Sound.
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DK13235C
(en)
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Devices for devices for automatic recording and reproduction of a played piece of music.
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DK7386C
(en)
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Resonance Head for Apparatus for Recording or Reproducing Sound and Tones.
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FR328513A
(en)
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An amplifier for phonographs and graphophones
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DK7863C
(en)
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Device for recording and reproducing sounds and tones.
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DK7862C
(en)
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Device for recording and reproducing sounds and tones.
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CH24954A
(en)
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Recording diaphragm for phonographs and graphones
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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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FR342646A
(en)
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Gramophone sound reproducing disc
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FR343623A
(en)
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Diaphragm for phonographs and other sound recording and reproducing apparatus
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FR334753A
(en)
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Diaphragm amplifier and tensioner for phonograph and graphophone
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FR403035A
(en)
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Fixed diaphragm recording and reproducing diaphragm for phonographs
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FR378192A
(en)
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Recording and reproducing apparatus for phonographs
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CA86017A
(en)
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Method of recording and reproducing sound vibration
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GB189401478A
(en)
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Improvements in connection with Phonographs, Grammaphones, Graphophones, and similar Sound Recording and Reproducing Instruments.
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FR411343A
(en)
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Method and device for recording and reproducing sound vibrations
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FR3979E
(en)
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Gramophone sound reproducing disc
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CA40179A
(en)
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Art of obliterating sound records from record tablets
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DK17791C
(en)
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Procedure for recording and reproducing tones.
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DK23140C
(en)
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Device for amplification and reproduction of sound waves.
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FR334001A
(en)
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Gramophone phonograph
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