AU2559030A
(en )
1930-11-11
Method of and apparatus for producing sound records
AU2559030B
(en )
1930-11-11
Method of and apparatus for producing sound records
AU2797230A
(en )
1931-07-30
Improvements insound records and method of producing thesame
AU2971330A
(en )
1931-03-26
Improvement in method and apparatus for sound reproduction
CA306175A
(en )
1930-12-02
Method of recording and reproducing sounds
CA300561A
(en )
1930-05-27
Sound reproducing apparatus
CA301303A
(en )
1930-06-17
Sound reproducing apparatus
CA299542A
(en )
1930-04-22
Apparatus for recording and reproducing sound
CA303223A
(en )
1930-08-19
Apparatus for recording and reproducing sound
CA306951A
(en )
1930-12-23
Sound amplifier and reproducing apparatus
CA298851A
(en )
1930-04-01
Method of producing ethanol amines
AU2734430A
(en )
1931-06-25
Process and apparatus for producing charcoal
CA305830A
(en )
1930-11-18
Method and apparatus for expanding tobacco
CA299303A
(en )
1930-04-15
Apparatus for producing sounds
CA301305A
(en )
1930-06-17
Sound recording apparatus
AU2978630A
(en )
1931-05-28
Improvement in method of making combined sound and picture record
CA313771A
(en )
1931-07-28
Method of making combined sound and picture records
CA303464A
(en )
1930-08-26
Method and means for combining frequencies
AU2741530A
(en )
1931-07-02
Improvements in and relating to apparatus for producing photographic sound recording
CA297051A
(en )
1930-01-28
Vibration recording and reproducing apparatus
CA303055A
(en )
1930-08-12
Method of producing magnetic materials
CA315780A
(en )
1931-10-06
Method and apparatus for producing pulp
CA300105A
(en )
1930-05-13
Bottle-sealing method and apparatus
AU1005127A
(en )
1928-03-06
Method of producing combined pictorial and sound records
AU2490030A
(en )
1930-08-12
Improvements insound record film and method of preparing same