4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Boring

Daiho Construction Co., Ltd.

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Caisson sinking method

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Vertical
Patent

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Control system for synchronous rotation of cutter heads, for use

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Having electrical synchronizing interconnections
Patent

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Shield tunnel boring machine

Mining or in situ disintegration of hard material – Hard material disintegrating machines – With mine roof-supporting means
Patent

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Underground excavator

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent

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