|
GB295034A
|
|
Improvements in or connected with film propelling mechanism
|
|
GB246099A
|
|
Improvements in sound reproducing devices
|
|
GB254032A
|
|
Telephone receiver
|
|
GB246351A
|
|
Shielding microphones and associated amplifier apparatus
|
|
GB245321A
|
|
Talking moving picture equipment
|
|
GB225840A
|
|
Improvements in talking moving picture machines
|
|
GB214938A
|
|
An improved sound reproducing attachment for moving picture projecting apparatus
|
|
GB214937A
|
|
Improvements in slot cleaning devices for machines for recording sound photographically, or reproducing sound from photographic records
|
|
GB206111A
|
|
Improvements in means for and method of controlling electric current by sounds
|
|
GB212867A
|
|
Improvements in electric discharge device for lighting
|
|
GB207153A
|
|
Improvements in means for protecting picture and like films
|
|
GB189183A
|
|
Improvements in sound recording and reproducing apparatus
|
|
GB192027A
|
|
Improvements in means for reproducing sound
|
|
GB188763A
|
|
Improvements in sound transmitters, and reproducers
|
|
GB193072A
|
|
Improvements in means for recording sounds
|
|
US1610692A
|
|
Railroad signaling system
|
|
GB146491A
|
|
Improvements in electrical signalling
|
|
GB160430A
|
|
Improvements in electrical signalling by means of alternating currents
|
|
CA292425A
|
|
Talking moving picture apparatus
|
