Fine adjustment device, especially for operating the axis of rotation of a variable resistor, variable capacitor or variometer
GB243718A
Adjusting scale for receiving sets
DE469209C
Piezoelectric resonance relay
DE469208C
Device for displaying and measuring the frequency of electrical oscillations using a luminous piezoelectric resonator
DE485660C
Intermediate frequency amplifiers using frequency-linear tuning means
DE467629C
Process for making elastic vibrations of piezoelectric crystals visible and application of this process for the display and measurement of frequencies and frequency fluctuations of electrical vibrations
DE468514C
Process for making the natural oscillation of quartz crystals perceptible, in particular for their adjustment to certain natural oscillations
