Openwork electrode for piezoelectric crystal transducers used for sound radiation
DE905553C
Openwork electrode for piezoelectric crystal transducers used for sound radiation
DE917037C
Device for reflecting mechanical vibrations
DE721793C
Device for reflecting mechanical vibrations
DE943323C
Device for sending or receiving mechanical vibrations
DE741706C
Device for sending or receiving mechanical vibrations
DE646298C
Piezoelectric crystal with deep longitudinal natural frequencies, especially for audio frequencies
DE628226C
Process for the production of a piezoelectric crystal, especially for audio frequency
DE614047C
Method for frequency control of electrical vibrations
DE645475C
Control device, in particular alternating current relay, in which the control effect or relay effect is brought about by the electrostatic attraction of oscillating piezoelectric crystals on moving bodies opposite them
