IEC TS 61994-4-4:2018 RLV EN 6a5576a6
Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection - Glossary - Part 4-4: Piezoelectric materials - Single crystal wafers for surface acoustic wave (SAW) devices
现行
发布日期 :
2018-11-16
实施日期 :
ISO 18941:2020 EN 764ec50c
Imaging materials — Colour reflection prints — Test method for ozone gas fading stability
现行
发布日期 :
2020-07-15
实施日期 :