IEC 60642:1979/AMD1:1992 Amendment 1 - Piezoelectric ceramic resonators and resonator units for frequency control and selection - Chapter I: Standard values and conditions - Chapter II: Measuring and test conditions
1992IEC 60642:1979/AMD1:1992 Amendment 1 - Piezoelectric ceramic resonators and resonator units for frequency control and selection - Chapter I: Standard values and conditions - Chapter II: Measuring and test conditions
1979IEC 60642:1979 Piezoelectric ceramic resonators and resonator units for frequency control and selection. Chapter I: Standard values and conditions. Chapter II: Measuring and test conditions