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

Wirth Maschinen- und Bohrgeräte-Fabrik GmbH

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Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Reexamination Certificate

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Tunnel-boring machine and method of using the same

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

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