DIN EN 61837-4:2005 频率控制和选择用表面安装的压电器件.标准外形和端头连接.第4部分:混合外壳的外形
Surface mounted piezoelectric devices for frequency control and selection - Standard outlines and terminal lead connections - Part 4: Hybrid enclosure outlines (IEC 61837-4:2004); German version EN 61837-4:2004