|
GB469928A
|
|
Improvements in or relating to cinematographic, television and other apparatus comprising optical and mechanical parts
|
|
GB469580A
|
|
Improvements in or relating to photographic sound recording
|
|
GB477215A
|
|
Improvements in or relating to sound recording
|
|
GB465430A
|
|
Improvements in or relating to oscillographs or light-valves, more particularly for use in sound recording
|
|
GB462869A
|
|
Method of and apparatus for the magnetic recording and reproduction of sound
|
|
GB456791A
|
|
Method for taking picture and sound records on a common photographic record carrier
|
|
GB460923A
|
|
An improved process for producing multi-sound records
|
|
GB429281A
|
|
A method of ascertaining the developing and printing conditions for photographic sound records
|
|
GB411678A
|
|
Improvements in or relating to the manufacture of sound and picture films
|
|
GB412321A
|
|
Improvements in or relating to the production of picture and sound films
|
|
US1974710A
|
|
Method of making sound records
|
|
US1997819A
|
|
Power transmitting mechanism
|
|
CA346390A
|
|
Sound record production
|
|
CA359590A
|
|
Sound record making apparatus
|
