DK50698C
(en )
1935-09-30
Electrodynamic sound reproducing apparatus.
DK54682C
(en )
1938-05-02
Apparatus for continuous writing and reproduction of photographic sound and tone streaks.
DK49970C
(en )
1935-03-04
Apparatus for showing sound films with musical accompaniment.
ES125722A1
(en )
1932-03-16
Improvements in the apparatus for the photographic recording of sounds.
DK48567C
(en )
1934-03-26
Apparatus for producing sound.
DK54468C
(en )
1938-03-14
Apparatus for Receiving Sound Waves.
ES122356A1
(en )
1931-05-01
An apparatus for the reproduction of sound films.
DK66414C
(en )
1948-03-08
Apparatus for Performing Films in Tone Films.
DK48815C
(en )
1934-05-28
Photographic Apparatus.
DK51614C
(en )
1936-05-11
Sound reproducing apparatus.
DK54244C
(en )
1938-01-31
Acoustic Apparatus.
DK51855C
(en )
1936-07-06
Acoustic Apparatus.
DK46384C
(en )
1932-10-31
Apparatus for the production of cinematographic films and the like, in particular sound films.
DK58472C
(en )
1941-03-03
Tone film with thank-you note and apparatus for making such a film.
DK51820C
(en )
1936-06-29
Apparatus for reproducing sound.
ES132273A1
(en )
1933-12-16
Improvements in the apparatus for the photographic recording of sounds.
ES129727A1
(en )
1933-04-01
Improvements in the apparatus for the photographic recording of sounds.
DK53828C
(en )
1937-11-08
Method and Apparatus for Making Silent Tone Films.
DK52615C
(en )
1937-01-25
Method with associated Apparatus for Forming Thin Materials.
DK48893C
(en )
1934-06-18
Cinematographic apparatus.
DK48936C
(en )
1934-07-02
Cinematographic apparatus.
ES123179A1
(en )
1931-07-01
Improvements in sound film projection apparatus.
ES123501A1
(en )
1931-08-01
Procedure for obtaining sound films.
DK52079C
(en )
1936-08-31
Apparatus for Generating Short Waves.
DK47397C
(en )
1933-06-06
Apparatus for Determining the Direction of a Sounder.