DK50698C
(en )
1935-09-30
Electrodynamic sound reproducing apparatus.
DK33891C
(en )
1924-11-17
Cinematographic Apparatus for Recording and Playback.
DK32687C
(en )
1923-12-31
Apparatus for recording and reproducing sounds and vivid images.
DK42626C
(en )
1930-07-21
Apparatus for recording and reproducing sound.
DK32844C
(en )
1924-02-11
Apparatus for the Recording and Production of Photographs.
DK38448C
(en )
1928-02-20
Method and Apparatus for Making Cinematographic Recordings.
AT112399B
(en )
1929-02-25
Sound recording and reproducing apparatus.
AT96099B
(en )
1924-02-25
Cinematographic recording apparatus.
DK40791C
(en )
1929-09-16
Apparatus for Recording and Reproducing Telephone Calls.
DK30420C
(en )
1922-10-09
Procedure and Apparatus for Recording and Reproducing Live Images with Music Accompaniment.
DK34575C
(en )
1925-06-02
Procedure and Apparatus for Recording Live Images.
DK32005C
(en )
1923-07-23
Apparatus for reproducing or recording sound.
DK55822C
(en )
1939-02-13
Procedure and Apparatus for Recording Sound.
AT110999B
(en )
1928-10-25
Turntable drive for sound recording and reproducing apparatus.
DK39273C
(en )
1928-09-24
Method and Apparatus for Cooling.
DK23994C
(en )
1919-01-27
Apparatus for simultaneous recording and reproduction of sounds and vivid images.
DK36883C
(en )
1926-12-06
Sound reproducing apparatus.
DK38386C
(en )
1928-01-30
Sound reproducing apparatus.
DK32994C
(en )
1924-03-24
Method and Apparatus for Producing Colored Cinematographic Images.
DK34877C
(en )
1925-08-17
Device for recording and reproducing sound.
DK38510C
(en )
1928-03-05
Sound reproducing apparatus.
FR596597A
(en )
1925-10-27
Cinematographic recording and reproducing apparatus
DK37697C
(en )
1927-07-11
Method and Apparatus for Cooling.
DK51820C
(en )
1936-06-29
Apparatus for reproducing sound.
CA215966A
(en )
1922-02-21
Photographic reproduction apparatus