WIKA-NGK INSULATORS, PT DKI Jakarta Electrical Insulators (of Glass - of Ceramics), Ir. Djokomulyono, MM. Ir. Elviss Nurhasal, MBA. (62-21) 2521262-63 (62-21) 2521262 Summitmas I, 11th Floor Jl. Jend. Sudirman Kav. 61-62, Jakarta Selatan