DK46426C
(en )
1932-11-07
Device for Receiving and Reproducing Sound.
DK42509C
(en )
1930-06-30
Acoustic Device for Receiving and Reproducing Sound.
DK45620C
(en )
1932-05-02
Procedure and device for recording sound on a voice recorder or similar.
FR712588A
(en )
1931-10-05
Device for receiving and reproducing acoustic oscillations
DK46590C
(en )
1932-12-05
Device for the operation of sound films, turntables and the like.
DK48346C
(en )
1934-02-05
For sound recording and similar purposes determined Oscillograph.
DK42626C
(en )
1930-07-21
Apparatus for recording and reproducing sound.
DK46262C
(en )
1932-10-03
Procedure for Making Sound Records.
DK55822C
(en )
1939-02-13
Procedure and Apparatus for Recording Sound.
DK47638C
(en )
1933-08-14
Device for sound recording and sound reproduction.
FR705593A
(en )
1931-06-10
Phonograph record
FR725084A
(en )
1932-05-07
Phonograph record
DK42373C
(en )
1930-06-10
Procedure and Device for Increasing Rail Friction.
DK34877C
(en )
1925-08-17
Device for recording and reproducing sound.
DK48474C
(en )
1934-03-05
Procedure and Device for Manufacturing Tape Cores.
DK41517C
(en )
1930-01-27
Device for Writing Down Sound.
DK47662C
(en )
1933-08-21
Sound amplifier.
ES120151A1
(en )
1930-11-16
Improvements in the procedures of impressed and reproduction of sounds.
DK45246C
(en )
1932-02-15
Device for rapid salting.
DK43770C
(en )
1931-03-02
Device for pushing in and out of carrier couplings and the like.
DK43097C
(en )
1930-10-06
Device for electrical vibration devices, in particular for the recording and reproduction of sound.
DK40072C
(en )
1929-04-22
Membrane for use in sound reproducing apparatus and system for influencing the same.
DK45612C
(en )
1932-05-02
Procedure and Device for Peeling Tobacco Leaves.
DK44401C
(en )
1931-07-27
Procedure and Device for Rolling Crepe Paper.
DK46802C
(en )
1933-01-23
Method and Device for Making Emulsions.