North Nippon Works Muroran Works
North Nippon Works Kamaishi Area
East Nippon Works Kashima Area
East Nippon Works Kimitsu Area
East Nippon Works Naoetsu Area
Nagoya Works
Kansai Works Wakayama Area (Wakayama / Kainan / Sakai)
Kansai Works Amagasaki Area
Kansai Works Osaka Area
Setouchi Works Hirohata Area
Setouchi Works Kure Area
Setouchi Works Hanshin Area
Kyushu Works Yawata Area
Kyushu Works Oita Area (Oita / Hikari Pipe Kyushu Works Oita Area & Tube Div.)