|
GB513788A
|
|
Improvements in or relating to apparatus for reproducing sound from sound film
|
|
GB507442A
|
|
Improvements in or relating to sound film apparatus
|
|
US2147623A
|
|
Sound film recording system
|
|
GB484038A
|
|
Improvements in or relating to methods of and apparatus for reproducing or re-recording recorded sound
|
|
GB492165A
|
|
Improvements in or relating to talking machines
|
|
GB492087A
|
|
Improvements in apparatus for the reproduction of sound films
|
|
GB490209A
|
|
Improvements in or relating to sound cameras for recording sound upon film strips
|
|
GB490210A
|
|
Improvements in or relating to apparatus for playing sound films
|
|
GB486221A
|
|
Improvements in or relating to processes for printing sound films
|
|
GB477952A
|
|
Improvements in or relating to sound film recording systems
|
|
GB474819A
|
|
Improvements in or relating to automatically operated time controlled talking machines and the like
|
