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PCE
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CPC Subgroup
H03H 9/205

having multiple resonators (crystal tuning forks H03H9/21)

Full Title

Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (electro-acoustic transducers such as loudspeakers, microphones or gramophone pick-ups H04R; piezoelectric, electrostrictive or magnetostrictive devices with mechanical input or output, e.g. actuators or sensors, H10N30/00, H10N35/00) > Constructional features of resonators consisting of piezoelectric or electrostrictive material (H03H9/25 takes precedence) > having multiple resonators (crystal tuning forks H03H9/21)