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Underground auger system

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Rotary cutter head with advance direction coincident or...
Reexamination Certificate

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Underground excavating machine having independently movable half

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

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Underground mining machine

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Sidewall-working
Reexamination Certificate

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Underground mining machine

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Sidewall-working
Reexamination Certificate

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Underground mining machine having temporary roof support means a

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

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Universal ripper miner

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

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Universal ripper miner

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

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Upward tunneling

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Rotary cutter head with advance direction coincident or...
Patent

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