DIN IEC/TS 61994-4-2*DIN SPEC 41994-4-2:2012-05
Действует
Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection - Glossary - Part 4-2: Piezoelectric and dielectric materials - Piezoelectric ceramics (IEC/TS 61994-4-2:2011)
