1990.6

- Reconstruction wireless network at Korean Electric    Power(Pusan, Keung-Nam Province)·

1993

- Installation a harbor Controlling system.

1994.10

- Construction a simplicity relay machine at Deagu Mobil
   Telecom

1994

- Projection the concentration of Beach bureau at Korea   Telecom.

1995.5

- Construction the DATA-communication equipment at    Korea  Electric Power.(in Pusan & Keungnam Province)

1996

- Expulsion Project SAR network for East sea of Korea & Incheon  ( Seoul Telecom)

1996

- Construction the CT-2 at Seoul Telecom. (Joongang,    Sinchon, Songdo telephone office)

1996

- Dimantlement of interconnection Cable (sector 96)  (South Seoul Telecom Office)

1996

- Track laying, establish 3,400line more in Pochon·

1998

- Installation The Ship Handling Simulator at Pusan, Inchon   HaeSa high school.

2000.1~5

- Construct a Seoul wireless station 1st at Korea
   Telecom.

2000.9

- Constructing Seoul wireless station 2nd at Korea   
   Telecom.

    2000

- Educational GMDSS equipment (KRSMA)

2000

- DTV Translater System (KRSMA)

2002

- Manufacturing and Supplying of Special Electronics (ETRI)