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List of well-known manufacturers of crystal oscillators
USA: Abracon, Connor-winfield, CTS, ECS, Jauch Quartz, Rakon, Raltron, Microsemi(Vectron)
Europe: Euro Quartz, Golledge, Micro Crystal, Morion
Japan: Citizen, Epson, Murata, Kyocera, KDS, NDK
Taiwan: Mercury, TXC, Taitien
The standard frequency for application
| Application | Standard Frequency |
| Wireless telecommunication, GPS, RF parking radar, navigation, | 16.000MHz，12.000MHz，26.000MHz,19.2MHz |
| MW synthesizer, RF signal generator | 10.000MHz, 100.000MHz |
| Bank Security instruments, Dongle, Test Equipments, Remote Meter Reading | 50.000MHz，48.000MHz，4.000MHz，12.000MHz，50.000MHz，10.000MHz， |
| Other Hardware | 14.318MHz, 24.576MHz， 25MHz, 27MHz, 32.768KHz |
This is the first one.
