4. Mining or in situ disintegration of hard material
  5. Hard material disintegrating machines
  6. Floor-working

David T. Allan

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Apparatus for scabbling concrete

Motors: expansible chamber type – Cyclically operable – Valveless distribution
Patent

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Control valve assembly

Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent

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Fluid operated undercutter

Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent

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Fluid operated undercutter

Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent

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Fluid operated wall groove cutter

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
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Profile ID: LFUS-PAI-P-445977

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