DIN 8313-2-1977 带电源的时钟及其机件的技术要求和验证.振荡器频率≤1000Hz.时钟机件的交货条件
Technical requirements and verification for clocks and clockmovements with electrical energy source; frequency of resonator 1000 Hz, terms of delivery for clock movements
Technical requirements and verification for clocks and clock movements with electrical energy source; frequency of resonator ≤1000 Hz,terms of delivery for clock movementsExigences techniques et méthode de contr?le pour horloges et movements d'horloge av