DK34921C
(en )
1925-08-31
Electrodynamic Apparatus for Converting Electrical Oscillations to Sound Oscillations and vice versa.
DK38749C
(en )
1928-05-07
Apparatus for Converting Electric Vibrations to Sound Vibrations and vice versa.
DK36404C
(en )
1926-08-23
Apparatus for Converting Electrical Oscillations to Sound Waves.
FR722913A
(en )
1932-03-30
Improvements to electrodynamic loudspeakers
DK56090C
(en )
1939-04-24
Method and Apparatus for Converting Sound Vibrations to Electrical Vibrations with Smaller Amplitude Range
DK41035C
(en )
1929-11-04
Apparatus for generating tympanic membrane vibrations.
DK39382C
(en )
1928-10-22
Procedure and equivalent Microphone for Converting Acoustic Vibrations to Electrical Capacity Vibrations.
DK34698C
(en )
1925-07-06
Apparatus for Converting Pressure Variations to Electrical Variations.
DK34490C
(en )
1925-05-11
Apparatus for Sending and Receiving Sound Waves.
FR30070E
(en )
1926-01-26
Vibrating membrane for telephone devices
DK33224C
(en )
1924-05-19
Apparatus for sound generation.
DK38510C
(en )
1928-03-05
Sound reproducing apparatus.
DK34289C
(en )
1925-03-23
Method and Apparatus for the production of radium-containing water.
DK34461C
(en )
1925-05-04
Method and Apparatus for Providing Tobacco Portions of the Same Volume.
DK36727C
(en )
1926-11-01
Method and Apparatus for Converting Alternating Current to Direct Current without Distinct Pulsations.
DK33190C
(en )
1924-05-12
Method and Apparatus for Determining the Direction of Received Electric Waves.
DK47598C
(en )
1933-07-31
Electrodynamic Sound Conversion Device.
DK41755C
(en )
1930-03-03
Device for Converting Electrical Oscillations to Mechanical.
DK44189C
(en )
1931-06-01
Vibration apparatus for generating electric current.
SU7168A1
(en )
1928-11-30
Diaphragm Electrodynamic Phone
DK40983C
(en )
1929-10-28
Procedure and Apparatus for Manufacturing Screws.
DK46935C
(en )
1933-02-13
Apparatus for amplifying audio frequency streams.
DK34006C
(en )
1924-12-29
Method and Apparatus for amplifying varying electric currents.
DK35417C
(en )
1925-12-21
Acoustic Apparatus.
DK43665C
(en )
1931-02-02
Acoustic Apparatus.