DIN IEC 61253-1-1994 压电陶瓷谐振器规范.IEC电子元器件质量评定体系.第1部分:总规范:合格鉴定批准
Piezoelectric ceramic resonators - A specification in the IEC quality assessment system for electronic components (IECQ) - Part 1: Generic specification; qualification approval; identical with IEC 61253-1:1993