4. Mining or in situ disintegration of hard material
  5. Hard material disintegrating machines
  6. Stepper-type advance-causing means
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Advancing system for coal winning machine

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent

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Apparatus for advancing a low-height drift through a subterranea

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent

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Apparatus for protecting of coal mine workers

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Stepper-type advance-causing means
Patent

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