|
GB333755A
|
|
Improvements relating to the manifolding of phonograms of magnetic material
|
|
GB325543A
|
|
Improvements in loudspeakers
|
|
GB324994A
|
|
Improvements relating to recording and reproducing sound
|
|
GB317222A
|
|
Improvements relating to loud speakers
|
|
GB317221A
|
|
Improvements in methods of reducing the intensity of unduly intense impulses in electrical amplifiers or loud speaker circuits
|
|
GB313706A
|
|
Improvements in microphones
|
|
GB309846A
|
|
Improvements in thermionic valve circuits
|
|
GB306253A
|
|
Improvements in inter-valve couplings for thermionic valves
|
|
GB272797A
|
|
Improvements in thermionic valve circuits
|
