- Korea Quartz Technology Co., Ltd
- Address:25-11, Jann-Dong, Yuseong-Gu
- Grace Electronics Co.
- Address:398-19,Sin-dong ,Yeongtong-gu, Suwon-si
- Quartz Tech Co., Ltd.
- Address:323-10,Songnae-dong ,Sosa-gu, Bucheon-si
- Sungchang International Inc.
- Address:Ba-4324,Gurobon-dong ,Guro-gu
- HOHYUN., LTD
- Address:35, Maegoksaneom-Ro
- EZTECK
- Address:Seocho-dong
- Sunny Electronics Corp
- Address:Mokhang-Dong 457
- N.SET Co.,Ltd.
- Address:# 308, Industry-University cooperation Building Dong-Eui University, Gaya Dong, Busanjin-Gu
- Dong Jin Electronics Co., Ltd.
- Address:C-3501, Dongil Techno Town, 889-1, Gwanyang 2-dong ,Dongan-gu, Anyang-si
- FCT Co., Ltd.
- Address:No. 609, Kyeryong Richeville, 945-2 Youngtong-dong, Youngtong-gu, Suwon-si, KYEONGGI-DO, korea
- Irech C&D Inc.
- Address:889-3,Gwanyang 2-dong ,Dongan-gu, Anyang-si
- Microquartz Electronics
- Address:28-702, Songpa-2Dong, Songpa-Gu, Seoul, Korea
- Buban Techron Co.,Ltd
- Address:156-1,Samseong-dong ,Gangnam-gu
- Daesanbestex World Co., Ltd.
- Address:3f Dalseo Taegu
- Mctron Electronics Co.,Ltd.
- Address:#230, 7-DONG, INDUSTRIAL MATERIAL LOGISTICS CENTRE 555-9, Hogye-dong ,Dongan-gu, Anyang-si
- Ike Co., Ltd.
- Address:318-8,Seoksu-dong ,Manan-gu, Anyang-si
- Comotech Corporation
- Address:Hyomun-dong,Hyomun-dong ,Buk-gu
- Namjoo Corporation
- Address:2-12, Changgok-ri, Paltan-myeon,
- Il Shin Communication Co., Ltd.
- Address:60-21,Gasan-dong ,Geumcheon-gu
- Barun Electronics Co., Ltd
- Address:634-1,Tongsam-ri ,Namsa-myeon ,Yongin-si