- Miyazaki Epson Corporation
- Nihon Dempa Kogyo (NDK) Co. LTD.
- Oscilloquartz (ADVA)
- Murata Manufacturing
- Daishinku Corp.(KDS)
- Rakon Ltd.
- River Eletec Corp.
- Vectron International (Microsemi Corp.)
- Siward Crystal Technology
- Hosonic Electronic