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- 4Tech World Co. Ltd.
- Abracon Corp.
- Adiva Technology Inc.
- Advanced Crystal Technology
- AEL Crystals Limited
- Amplitronix LLC
- Anderson Electronics
- Andhra Electronics Limited
- ASC Semiconductors
 now Astor Limited
- Astor Limited
- AVX/Kyocera Ltd.
check Kyocera Electronic
or Kyocera [Germany]
- AXTAL Products crystal oscillators, crystal filters, and frequency & time modules
- Baknor
- Beijng Hope Metal Material Co. Ltd.
- Beijing Vanlong Technical Co. Ltd.
- Bharat Electronics Limited [BEL]
- Bliley Electric Co.
- Bomar
- Bontic Electronic Company
- C-MAC MicroTechnology
Frequency Control Products business (FCP) aquired by Rakon Limited
- Cal Crystal Lab, Inc.
- Caliber Electronics
- Cardinal
- Champion Technologies, Inc. now MtronPTI
- CEIEC Shenzhen
- CEPE
acquired by C-MAC MicroTechnology now Rakon Limited
- Ceratronics Ltd. [Zhejiang Jiakang Electronics Co. Ltd.]
- CFP
acquired by C-MAC MicroTechnology now Rakon Limited
- Chequers Electronic Co. Ltd [Suzhou]
- Chequers Electronic (China) Limited
- CHUNGHO ELCOM
- Cinetech
- Citizen Watch Co. [Japan]
check Citizen America Corporation
or Citizen Europe too!
- Commutek Electronics Ltd.
- Connor-Winfield Corporation
- Corning Frequency Control, Inc.
acquired by Vectron International
- Crystal Works
- Crystek Corporation
- CTSCorporation
check CTS Ceratech Corporation too!
- CTS Knights, Inc.
- DAISHINKU CORP. [KDS]
- eCERA ComTek Corporation
- Ecliptek Corporation
- ECM Electronics Limited
- ECS Inc. International
- EDC [Electro Dynamics Crystal Corporation]
- Electro Dynamics Crystal Corporation [EDC]
- Fargo
- FOQ Piezo Technik GmbH
- Fordahl
- Fox
- Frequency Management
- Fronter Electronics Co. Ltd.
- Geyer Electronic
- Golledge
- Greenray Industries
- Hankyung Telecom
- HCD
- Hertz Technology Inc.
- Hong Kong X'tal [HKC]
- Hooray Electronics Company
- Hosonic Electronics Company
- Huang Cheng
- Huilong Electronic (Jinhua ) Co. Ltd.
- Hy-Q International
check Hy-Q International (UK) Ltd. too!
- ILSI America, Inc.
- IQD Limited
acquired by C-MAC MicroTechnology now Rakon Limited
- ISOTEMP RESEARCH, Inc.
- Jauch Quartz GmbH
check Jauch Quartz America too!
- Jiakang Ceratronics Ltd.
- KONY Precision Co. Ltd.
now CHUNGHO ELCOM
- KDS [DAISHINKU CORP.]
- K.D.K [KYUSHU DENTSU CO., LTD.]
- KVG Quartz Crystal Technology GmbH
- Kyocera Electronic
check Kyocera [Germany]
or AVX/Kyocera Ltd. too!
- KYOCERA KINSEKI Corporation
- KYUSHU DENTSU CO., LTD. [KDK]
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- Lap-Tech Inc.
- Liberal Industrial Limited
- Lorch Microwave
- M-tron Industries now MtronPTI
- Macrobizes Co. Ltd.
- Manudax crystals and crystal oscillators
- MDX
- Meiden
acquired by SIWARD CRYSTAL TECHNOLOGY CO. LTD.
- Mercury [MEC]
- MF Electronics Corp.
- Micro Crystal [MC], an ETA company
- Micro Networks
- MMD Components
- Monitor Products Company Inc.
acquired by MMD Components
- MTI-Milliren Technologies, Inc.
- MtronPTI
- Nanjing Electronic Devices Institute [NEDI]
- NDK [NIHON DEMPA KOGYO CO. LTD.]
- NEDI [Nanjing Electronic Devices Institute]
- NEL Frequency Controls, Inc.
- NIHON DEMPA KOGYO CO. LTD. [NDK]
- Oak Frequency Control
now: Corning Frequency Control, Inc.
- OFC
now: Corning Frequency Control, Inc.
- Omig S.A.
- OnSpec Oscillators
- Oscilent Corporation
- Oscillatek
acquired by Vectron Technologies
- Panasonic Japan
check Panasonic
or Panasonic
or Panasonic USA
or Panasonic Semiconductor Company too!
Chip Tantalum Capacitor Unit acquired by Nichicon
- PDI [Precision Device Inc.]
- PhaseLink
- Piezo Technology, Inc. [PTI] now MtronPTI
- Pletronics, Inc.
- Precision Device, Inc. [PDI]
- Q-Tech
- QCT
- Quartz Crystal
- QuartzMaker
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- Quartztek
acquired by MMD Components
- Rakon Limited
- Raltron
- RF Monolithics Inc. [RFM]
- River Eletec Corp.
- RXD Technologies, L.L.C.
- Samsung Electro-Mechanics
- SaRonix LLC
acquired by Pericom Semiconductor Corp.
- Sawtek Incorporated
acquired by TriQuint Semiconductor
- Seiko Epson Electronics clock oscillators
- Sentry
- SIWARD CRYSTAL TECHNOLOGY CO. LTD.
- SJK [Shenzhen Crystal Technology]
- Shoulder Electronics
- SPK Electronics Co. Ltd.
- Statek Corporation
- Sunny-Electronics Corp.
- Suzhou Chequers Electronic Co. Ltd
- Tai Tien Electric Co. Ltd.
- Technical Crystal Limited
- Tech-Time
- Tekelec Temex
- Tele Quarz Group now Corning Frequency Control
acquired by Vectron International
- Tellurian Technologies, Inc.
- TEW
- Token Electronics Ind. Co. Ltd.
- TOYOCOM
- Trans-Tech Inc.
- TXC Corporation
- US Crystal Corp.
acquired by Electro Dynamics Crystal Corporation [EDC]
- ValpeyFisher
- Vanlong Technology Co., Ltd. [VTC]
- Vectron International
- Vishay Intertechnology Inc.
- VITE Technology Express.
- Wenzel Associates
- World Technologies, LTD. [WTL]
- WTL [World Technologies, LTD.]
- Xtal Technologies Ltd.
- Z-Communications, Inc.
- Zhejiang Jiakang Electronics Co. Ltd. [Ceratronics Ltd.]
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