CH232943A
(en )
1944-06-30
Device for stereophonic sound reproduction.
CH244197A
(en )
1946-08-31
Magnetic amplifier.
DK69405C
(en )
1949-06-20
Method for producing gramophone records on sound records.
CH241233A
(en )
1946-02-28
Sound recording device.
CH245730A
(en )
1946-11-30
Device for the stereophonic recording of sound vibrations.
FR986662A
(en )
1951-08-03
Phonographic pick-up
DK63875C
(en )
1945-08-27
Gramophone record stand.
DK73087C
(en )
1951-09-17
Sound recorder.
DK74578C
(en )
1952-08-18
Sound recorder.
FR902750A
(en )
1945-09-11
Illustrated phonographic record
DK64994C
(en )
1946-11-04
Procedure for the production of gramophone records.
DK64136C
(en )
1945-12-03
Disc changer for Magasing gramophones.
DK68970C
(en )
1949-04-19
Audio recording method with the minimum allowable tone track distance.
ES9723Y
(en )
1945-09-01
Gramophone needle for application on gramophone records.
DK66712C
(en )
1948-05-03
Stereophonic recording device.
GR10018B
(en )
1943-01-12
METHOD FOR PRODUCTION OF SOUND MOVIES.
DK69025C
(en )
1949-04-25
Method for producing magnetic sound recordings, preferably using high frequency pre-magnetized tone carriers.
DK67378C
(en )
1948-08-09
Plate change mechanism for Magasing gramophones.
DK64755C
(en )
1946-09-02
Automatic Disc Change Mechanism for Magasing Gramophones.
DK63728C
(en )
1945-07-23
Automatic Disc Change Mechanism for Magasing Gramophones.
ES9968Y
(en )
1945-07-16
Improved case for cataloging gramophone records.
FR899054A
(en )
1945-05-18
Phonograph record
DK70959C
(en )
1950-05-01
Method for producing images on porous, liquid-absorbent fibreboard.
CA416471A
(en )
1943-11-16
Sound record
CA410413A
(en )
1943-02-02
Sound record mixing method