| B 06 B | GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL (for particular physical or chemical processes, see the relevant subclasses, e.g. B 07 B 1/40, B 22 C 19/06, B 23 Q 17/12, B 24 B 31/06, E 01 C 19/22; measurement of mechanical vibrations, including the combination of generation and measurement, G 01 H; systems using reflection or reradiation of acoustic waves G 01 S 15/00; generating seismic energy for prospecting G 01 V 1/02; control of mechanical vibrations G 05 D 19/00; methods or devices for transmitting, conducting or directing sound, in general G 10 K 11/00; synthesis of acoustic waves G 10 K 15/02; piezo-electric, electrostrictive or magnetostrictive elements H 01 L 41/00; motors with vibrating magnet, armature or coil H 02 K 33/00; motors using piezo-electric effect, electrostriction or magnetostriction H 02 N 2/00; generation of electrical oscillations H 03 B; electromechanical resonators as resonant circuit elements H 03 H; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H 04 R) [2]
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