DIN EN IEC 60122-4:2019-10 Quartz crystal units of assessed quality - Part 4: Crystal units with thermistors (IEC 60122-4:2019); German version EN IEC 60122-4:2019
2019DIN EN IEC 60122-4:2019-10 Quartz crystal units of assessed quality - Part 4: Crystal units with thermistors (IEC 60122-4:2019); German version EN IEC 60122-4:2019