DK7386C
(en)
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Resonance Head for Apparatus for Recording or Reproducing Sound and Tones.
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DK7862C
(en)
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Device for recording and reproducing sounds and tones.
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DK7863C
(en)
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Device for recording and reproducing sounds and tones.
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DK9120C
(en)
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Apparatus for recording, storing and reproducing sound by telegraphic means.
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ES37342A3
(en)
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Improvements in sound recorders for gramophones and analog instruments sound recorders and reproducers.
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DK7187C
(en)
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Automatic device for producing and reproducing sounds and tones.
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DK17791C
(en)
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Procedure for recording and reproducing tones.
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FR378192A
(en)
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Recording and reproducing apparatus for phonographs
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ES40023A2
(en)
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An apparatus for the reproduction and amplification of sounds.
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ES37277A1
(en)
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An apparatus for the reproduction and amplification of sounds.
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FR379888A
(en)
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Improvements to the recording and reproducing diaphragm for disc or cylinder phonographs
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FR377396A
(en)
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Phonograph combined with string vibrator for sound amplification
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CH49934A
(en)
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Method for recording and reproducing living, sound photographs for the purpose of synchronizing the cinematograph and the speaking machine
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FR403035A
(en)
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Fixed diaphragm recording and reproducing diaphragm for phonographs
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CH42200A
(en)
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Method for recording sound images for sound reproducing apparatus
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FR373148A
(en)
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Method and apparatus for recording and reproducing long speeches, music, etc., using phonographic instruments
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FR8578E
(en)
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Method and apparatus for recording and reproducing long speeches, music, etc., using phonographic instruments
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CH36759A
(en)
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Device for recording and reproducing sound waves on and with the panes of talking machines
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CH24954A
(en)
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Recording diaphragm for phonographs and graphones
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FR372541A
(en)
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Improvements to the recording and reproducing diaphragm for phonographs
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FR328513A
(en)
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An amplifier for phonographs and graphophones
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CH49153A
(en)
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Apparatus for recording and reproducing sounds
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FR383226A
(en)
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Recording method for sound reproduction
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DK11675C
(en)
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Voice plate for Accordions and the like.
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CH61230A
(en)
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Device on record speaking machines for recording and reproducing sounds
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