- Se Jin Instrument Co., Ltd.
- Waistband Amplifier (WAP - 5D),Analogue Multimeters (1106),Horn Speaker System (TH - 4A4),Dynamic Microphone (SJ 305),Power Megaphone (ER - 67S).
- Address:116-4,Jangsa-dong ,Jongno-gu
- Jaeil Chemical Products Co., Ltd.
- P3234,Breathable Fabric (Thumbprint 2-Layer),P.A Horn Speaker,P/V relief valve SBE,P1473E,P/N Satin Organdy ,P.C.F valve,P.A Horn Speaker.
- Address:730, KUMHYUN-RI, KASAN-MYON POCHON-GUN
- SAMJOO ELECTRONICS CO
- Megaphone,PA amplifier,PA Speaker,Horn speaker,column speaker,driver unit,microphone.
- Address:64-14, Changhyeon-ri, Hwado-eup,
- A&D Engineering Co., Ltd.
- Public Warning System,Mass Notification System,tsunami warning,Civil Defense System,Radio Monitoring System,Disaster Management,siren,spectrum direction finding,spectrum management,horn speaker.
- Address:719-4 Daerim-dong, Yeongdeungpo-gu
1