Seiko Epson
Nihon Dempa Kogyo (NDK)
TXC
Kyocera Crystal Device (KCD)
Daishinku Corp (KDS)
Siward Crystal Technology
Hosonic Electronic
River Eletec
Micro Crystal
Failong Crystal Technologies
ZheJiang East Crystal
Guoxin Micro
Vectron International
Rakon
NSK (JenJaan Quartek Corporation)
Abracon
Diodes Incorporated
Taitien
Pletronics
TKD Science and Technology
Crystek
CTS Corporation
IQD Frequency Products
NEL Frequency Controls
Aker Technology