4. Mining or in situ disintegration of hard material
  5. Hard material disintegrating machines
  6. With mine roof-supporting means

Toshihiko Bessho

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Main-ancillary tunnel excavator

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

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Method and apparatus for continuously excavating shaft and tunne

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

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Profile ID: LFUS-PAI-P-608504

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