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Tadao Yoshikawa
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Ibaraki, JP
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last 30 patents
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Patent Grant
Shield tunneling machine and earth removing apparatus therefor
Patent number
4,456,304
Issue date
Jun 26, 1984
Hitachi Shipbuilding & Engineering Co., Ltd.
Tadao Yoshikawa
E21 - EARTH DRILLING MINING
Information
Patent Grant
Shield tunneling machine
Patent number
4,456,305
Issue date
Jun 26, 1984
Hitachi Shipbuilding & Engineering Co., Ltd.
Tadao Yoshikawa
E21 - EARTH DRILLING MINING