AU106311B2
(en )
1939-01-19
Improvements in or relating to methods of reproducing sound records in a plurity of sound traces
AU220938A
(en )
1939-01-19
Improvements in or relating to methods of reproducing sound records in a plurity of sound traces
AU102413B2
(en )
1937-11-18
Improvements in or relating to methods of producing a sound record by photochemical agency
AU109431B2
(en )
Improvements in or relating to sound reproducing devices
AU56137A
(en )
1937-11-18
Improvements in or relating to methods of producing a sound record by photochemical agency
AU104921B2
(en )
Improvements relating to photographic sound records and methods of producing same
AU108294B2
(en )
1939-08-31
Improvements in or relating to methods for electromechanical recording of sound vibrations
AU104772B2
(en )
1938-08-25
Improvements in or relating to devices for recording or reproducing picture-or picture-and-sound films
AU215638A
(en )
1939-06-08
Improvements in or relating to acoustic reproducer arrangements
AU104880B2
(en )
1938-09-01
Improvements in and relating to sound recording mechanism
AU57239A
(en )
1939-08-31
Improvements in or relating to methods for electromechanical recording of sound vibrations
AU547637A
(en )
1938-08-25
Improvements in or relating to devices for recording or reproducing picture-or picture-and-sound films
AU109632B2
(en )
1940-02-01
Improvements in or relating to methods of mechanical scanning of sound recordings
CA376877A
(en )
1938-10-04
Sound record production
AU354837A
(en )
1938-09-01
Improvements in and relating to sound recording mechanism
AU114109B2
(en )
Improvements in or relating to sound recording and reproducing systems
AU350539A
(en )
1940-02-01
Improvements in or relating to methods of mechanical scanning of sound recordings
AU105771B2
(en )
1938-11-24
Improvements in or relating to sound film recording systems
AU563032A
(en )
1933-01-12
Improvements in or relating to production of phonograph records
AU112319B2
(en )
1939-01-09
Improvements in or relating to devices for recording and reproducing films
AU103515B2
(en )
1938-03-31
Improvements relating to sound reproducing apparatus
AU100610B2
(en )
1937-04-08
Production of sound records
AU337537A
(en )
1938-11-24
Improvements in or relating to sound film recording systems
AU105271B2
(en )
1938-10-06
Improvement insound recording and reproducing
AU107236B2
(en )
1939-05-04
Improvements in or relating to acoustic reproducers