AT107964B
(en )
1927-11-25
Device for reproducing sound waves photographed on film.
CH122103A
(en )
1927-09-01
Device for transmitting vibrations.
CH152937A
(en )
1932-02-29
Device for showing optical sound films.
DK37820C
(en )
1927-08-15
Sound reproducing apparatus.
AT112399B
(en )
1929-02-25
Sound recording and reproducing apparatus.
AT104641B
(en )
1926-11-10
Device for atomizing fuels.
DK41058C
(en )
1929-11-11
Electromagnetic sound reproducing apparatus.
DK39198C
(en )
1928-09-03
Sound reproduction apparatus.
DK38776C
(en )
1928-05-21
Sound Reproducing Device (Speaker).
DK38638C
(en )
1928-04-02
Sound Reproducing Device (Speaker).
FR605692A
(en )
1926-05-31
Acoustic filtration device
DK32596C
(en )
1923-12-10
Device for sound reproducing apparatus.
FR591021A
(en )
1925-06-26
Self-regulating system for whistles
AT96099B
(en )
1924-02-25
Cinematographic recording apparatus.
AT108996B
(en )
1928-02-25
Acoustic device.
AT108834B
(en )
1928-02-10
Device for actuating the shutter of cinematographic image recording apparatus.
AT132150B
(en )
1933-03-10
Device for the photographic recording of acoustic vibrations.
ES95052A1
(en )
1925-12-16
Receiving facility for underwater sounds.
AT96115B
(en )
1924-02-25
Device for moving the film tape in cinematographic apparatus.
FR620656A
(en )
1927-04-27
Speaker enhancements for t. s. f.
FR604314A
(en )
1926-05-03
Device for receiving t. s. f. suitable for phonographic reproduction devices
DK38775C
(en )
1928-05-21
Sound Reproducing Device (Speaker).
ES92601A1
(en )
1925-05-16
An acoustic horn mount.
ES90647A1
(en )
1924-11-01
A photographic reproduction apparatus.
CH95337A
(en )
1922-07-01
Honeycomb cover apparatus.