Method and apparatus for continuously excavating shaft and tunnel
 A shield excavator excavates a shaft. Then, the excavator is caused to swing to change its posture and excavate a tunnel. Thus, the shaft and the tunnel is continuously excavated by the single machine. 
Taisei Corporation Ishikawajima-Harima Jukogyo Kabushiki Kaisha
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E21D E21D
inventional inventional
Kenichi Toshihiko Toshiaki Hiroyuki Toshimi
Kaneko Bessho Uehara Ito Ino