DK48586C
(en )
1934-04-03
Device for Recording Tone Films Using Multiple Microphones.
DK46707C
(en )
1933-01-02
Device for systems for reproducing recorded sounds.
DK58416C
(en )
1941-02-10
Device for Tone Recording Cameras.
DK49088C
(en )
1934-08-06
Procedure for Making Tone and Picture Films.
DK48057C
(en )
1933-11-20
Device for Controlling a Tone Film.
DK48023C
(en )
1933-11-13
Device for Miniature Pianos.
DK46775C
(en )
1933-01-16
Device for sound reproducing apparatus.
DK55046C
(en )
1938-08-01
Device for photoelectric sound recording or reproducing apparatus.
DK46616C
(en )
1932-12-12
Procedure for Making Tone Films.
DK49490C
(en )
1934-11-05
Drive for Filming.
DK48816C
(en )
1934-05-28
Device for Photographic Apparatus.
FR751698A
(en )
1933-09-07
Recording sound films
CH175397A
(en )
1935-02-28
Sound pickup device.
DK55934C
(en )
1939-03-13
Drive device for Tone Film Apparatus.
DK49970C
(en )
1935-03-04
Apparatus for showing sound films with musical accompaniment.
ES123501A1
(en )
1931-08-01
Procedure for obtaining sound films.
DK46207C
(en )
1932-09-19
Device for Viewing Films.
CA322460A
(en )
1932-05-17
Photographic sound recording
DK46816C
(en )
1933-01-23
Device for Miniature Pianos.
DK47953C
(en )
1933-10-30
Device for desk telephones.
DK51429C
(en )
1936-03-23
Films Synchronization Procedure.
ES126325A1
(en )
1932-05-16
New phonographic reproduction by optical reflection.
DK48473C
(en )
1934-03-05
Device for automatic telephone systems.
CA322461A
(en )
1932-05-17
Film sound record apparatus
DK50688C
(en )
1935-09-23
Procedure for Lowering Lowering Boxes.