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

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

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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 for boring and placing bolts for imbedding adhesively...

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

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Mine roof bolting apparatus and method of using the same

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

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Mining apparatus and method

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

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Mining machine with multiple propulsion members

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

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Mining system with drilling, loading, conveyor, and support

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

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