About KOGA YUTAKA
About 九州石炭鉱山技研セ
About TESHIMA TOSHIYUKI
About 九州石炭鉱山技研セ
About TANAKA MAKOTO
About 九州石炭鉱山技研セ
About OGATA YUJI
About 九州石炭鉱山技研セ
About INOUE KUNIZO
About 九州石炭鉱山技研セ
About WADA RYOUMA
About 九州石炭鉱山技研セ
About MATSUGUMA TARO
About 九州石炭鉱山技研セ
About ISEI TAKEHIRO
About 九州石炭鉱山技研セ
About coal mine
About blasting
About Various explosives and propellants
About Mine fire,explosion and gas
About 含水爆薬
About メタン
About 安全度