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Excavation machine for hard rock mining

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Cutter shiftable horizontally
Reexamination Certificate

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Excavation machine having combined impact hammers and static rip

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Percussive-type cutter
Patent

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Excavator and conveyor of an underground pipeline jacking appara

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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Excavator for use in a tunneling shield

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

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Excavator, particularly for continuous strip mining of minerals

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

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Excavators

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Remote control
Patent

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Excavatory machine for use in coal and other mining opertions

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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