4. Measuring and testing
  5. Borehole or drilling
  6. Downhole test

Tekken Kensetu Co. Ltd.

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Apparatus and method of measuring fluctuations of excavated mud

Measuring and testing – Borehole or drilling – Downhole test
Patent

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Apparatus and method of shield excavation

Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent

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Brush-type packing means for shield excavator

Patent

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Brush-type packing means for shield excavator

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

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