|
GB405117A
|
|
Improvements in or relating to electric filters
|
|
GB405281A
|
|
Improvements in telegraph or telephone systems using in part sound or elastic waves as the agency of communication
|
|
GB311004A
|
|
Improvements relating to magnetostrictive and piezo-electric vibratory systems
|
|
GB313031A
|
|
Magnetostrictive vibrator
|
|
GB283116A
|
|
Magnetostrictive vibrator
|
|
GB314891A
|
|
Magnetostrictive vibratory systems and apparatus for use in subaqueous and other signalling systems
|
