Apparatus for optical sound recording and reproducing
US2084947A
Apparatus for reproducing sounds recorded on strips
AT126684B
Arrangement for the uninterrupted playback of several sound recordings running side by side on tapes.
GB373585A
Talking machine
GB363098A
A sound film band with a plurality of records prepared by the zig zag outline method
GB351772A
Apparatus for the reproduction of sound-films
DE540282C
Device for alternately driving films, especially sound films, in different directions
US1843708A
Apparatus for reproducing sounds recorded on films
DE514972C
Selenium cell of the capacitor type using conductive plates made of two types of metal, placed on edge and isolated from one another by mica lamellae, of which only one can be wetted by molten selenium
GB349528A
Soundfilmband and process of producing it
US1791389A
Light valve
GB341848A
Apparatus for photographically recording alternating currents
GB338652A
Device for securing uniformity of movement in the reproduction of sound films
GB339302A
Improvements relating to photographic sound records
GB337084A
Damping device for oscillographs, particularly for photographically recording sound
GB336699A
Improvements relating to combined sound and picture film reproduction
GB334354A
Sound-film band and process of recording sound thereupon
GB337772A
Apparatus for making recording and reproducing films, particularly sound films
