4. Mining or in situ disintegration of hard material
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Hydraulically actuated tool for mechanically splitting rock-like

Mining or in situ disintegration of hard material – Expansible breaking-down devices – Fluid-pressed element
Patent

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Hydraulically ejectable mineral cutting apparatus

Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable-type bit mount
Reexamination Certificate

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Hydrocarbon fuel recovery

Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent

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Hydromechanical planer with cutting and breaking heads

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Cutter attached to endless chain or cable
Patent

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Hydrovac excavating blast wand

Mining or in situ disintegration of hard material – Processes – Breaking down by direct contact with fluid
Reexamination Certificate

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