DIN 8312-2-1975 钟表及其精密运动装置的技术要求和检验.带电源和频率≤1000Hz振荡系统的的钟表
Technical requirements and verification for watches and watch movements; watches with electrical energy source, frequency of oscillating system 1000 Hz
Technical requirements and verification for watches and watch movements; watches with electrical energy source, frequency of oscillating system ≤ 1000 HzExigences techniques et contr?le pour montres et movements;montres avec alimentation électrique, fré