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DK24366C
(en)
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Procedure for simultaneous recording and reproduction of movement and sound.
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DK25361C
(en)
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Membrane for Recording and Reproduction of Sound.
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DK30765C
(en)
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Device for recording and reproducing sound.
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DK25063C
(en)
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Procedure for Writing Down and Reproducing Sound.
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DK23994C
(en)
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Apparatus for simultaneous recording and reproduction of sounds and vivid images.
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DK32005C
(en)
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Apparatus for reproducing or recording sound.
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DK34877C
(en)
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Device for recording and reproducing sound.
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DK54148C
(en)
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Procedure and arrangement of apparatus for recording and reproducing sound.
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DK33968C
(en)
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Apparatus for apparatus for recording and reproducing phonographic sound waves.
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DK42626C
(en)
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Apparatus for recording and reproducing sound.
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DK24055C
(en)
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Procedure for Refreshing Gramophone Records.
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DK34386C
(en)
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Device for Distortion-Free Amplification of Sounds and Tones for Acoustic Cinematographic Purposes.
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DK46385C
(en)
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Performance Film for Reproduction of Sound and Procedure for Recording Sound according to the Intensity Method.
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DK35471C
(en)
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Procedure for the transmission of sound by electrical means and for the recording and reproduction of sound film.
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DK32388C
(en)
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Device for photographic recording of sounds.
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DK33891C
(en)
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Cinematographic Apparatus for Recording and Playback.
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DK25191C
(en)
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Sound recorder for voice machines.
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DK23590C
(en)
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Device for Recording and Reproducing Talking Live Images.
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GB156217A
(en)
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An apparatus for the reproduction of sound-vibrations
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AT112399B
(en)
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Sound recording and reproducing apparatus.
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DK32844C
(en)
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Apparatus for the Recording and Production of Photographs.
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FR540869A
(en)
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Device for reproducing sound waves
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FR514175A
(en)
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Recording and reproducing apparatus for phonographs
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DK24551C
(en)
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Audio amplifier for Telephones and the like.
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DK35609C
(en)
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Gramophone record and method of its manufacture.
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