4. Mining or in situ disintegration of hard material
  5. Hard material disintegrating machines
  6. Stepper-type advance-causing means
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Self-advancing mine roof supports

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

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Self-advancing mineral mining installation including tilting mac

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

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Shaft-sinking apparatus with milling head and central worm conve

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

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Shield machine

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

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Shortwall mining machine

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

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Slideway means and excavating machines comprising slideway means

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

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Softwall mining method and device

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

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