|
GB363410A
|
|
Improvements in or relating to piezo-electric devices
|
|
GB356782A
|
|
Improvements in or relating to thermionic valve systems
|
|
US1774822A
|
|
Rectifier choke coil
|
|
GB318159A
|
|
Improvements in battery eliminator chokes
|
|
GB316330A
|
|
An improved electrolytic condenser
|
|
GB302838A
|
|
Improvements in pick-up and amplifying devices for use with gramophones and the like
|
|
GB306855A
|
|
Improved means for connecting electrical pick-up devices of gramophones and the likewith radio receivers
|
|
GB305052A
|
|
An improved amplifying device for use in conjunction with an electrostatic microphone, gramophone or the like
|
|
GB285315A
|
|
Improvements in electrical pick-up and amplifying devices for use with gramophones and the like
|
|
US1840298A
|
|
Variable electrical condenser
|
|
GB252789A
|
|
Improvements in electrical frequency-changing apparatus of the thermionic type
|
|
GB241661A
|
|
Improvements in electrical devices, such as variable electrostatic condensers, variable inductances and the like
|
