DK54682C
(en )
1938-05-02
Apparatus for continuous writing and reproduction of photographic sound and tone streaks.
DK46385C
(en )
1932-10-31
Performance Film for Reproduction of Sound and Procedure for Recording Sound according to the Intensity Method.
DK46426C
(en )
1932-11-07
Device for Receiving and Reproducing Sound.
SU20357A1
(en )
1931-04-30
Sound film
DK54148C
(en )
1938-01-10
Procedure and arrangement of apparatus for recording and reproducing sound.
DK47638C
(en )
1933-08-14
Device for sound recording and sound reproduction.
DK42626C
(en )
1930-07-21
Apparatus for recording and reproducing sound.
ES120151A1
(en )
1930-11-16
Improvements in the procedures of impressed and reproduction of sounds.
DK51701C
(en )
1936-06-02
Procedure for the production of sound plates suitable for recording, reproduction and matriculation.
AT112399B
(en )
1929-02-25
Sound recording and reproducing apparatus.
ES126802A1
(en )
1932-07-01
Procedure of recording and reproduction of sounds.
DK34877C
(en )
1925-08-17
Device for recording and reproducing sound.
ES121100A1
(en )
1931-01-16
A procedure for recording and reproducing sounds.
FR710349A
(en )
1931-08-21
Further training for reproducers of music recorded on cinematographic film
DK45620C
(en )
1932-05-02
Procedure and device for recording sound on a voice recorder or similar.
DK35471C
(en )
1926-01-04
Procedure for the transmission of sound by electrical means and for the recording and reproduction of sound film.
DK49763C
(en )
1935-01-14
Procedure for Mechanical Recording of Oscillations, in particular Sound Oscillations, and Carriers Applicable to this Procedure.
FR705593A
(en )
1931-06-10
Phonograph record
DK43526C
(en )
1930-12-22
Procedure for Combined Use of Film and Telegraph in Recording and Reproduction of Images together with the Images Accompanying Speech or the like.
DK55822C
(en )
1939-02-13
Procedure and Apparatus for Recording Sound.
DK48346C
(en )
1934-02-05
For sound recording and similar purposes determined Oscillograph.
FR664930A
(en )
1929-09-12
Method and system of phonographic reproduction
DK32005C
(en )
1923-07-23
Apparatus for reproducing or recording sound.
DK37147C
(en )
1927-02-21
Fluid for Applying Gramophone Records and Similar Voice Types.
DK43219C
(en )
1930-10-20
Method of Cooling Using Solid Carbon dioxide.