List of companies-Construction/ Equipment/ Electrical/ Engineering- UEKI Corporation JLPT N2以上 NANBA Co., Ltd. YAMAZAKIGUMI Co., Ltd. JLPT N1以上 Nagaoka Motor Development Co., Ltd. Ohara Corporation JLPT N3以上 DAICHI JLPT N2以上 Hokuetsu Engineering Co., Ltd. JLPT N3以上 DAISHI Co., Ltd KUBOSEI ELECTRIC ETRUST Co., Ltd. Omni Giken Co., Ltd. JLPT N2以上
