4. Boring or penetrating the earth
  5. Bit or bit element
  6. Impact or percussion type

Robert H. Montgomery, Jr.

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Cold headed center vacuum drill bit

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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Cold headed center vacuum drill bit

Metal tools and implements – making – Blank or process – Drill
Patent

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Cutting bit support member with undercut flange for removal

Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Wear shield or replaceable wear sleeve
Reexamination Certificate

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Cutting tool assembly with replaceable spray nozzle

Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Cleansing fluid passage
Reexamination Certificate

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Cutting tool holder assembly with press fit

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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Profile ID: LFUS-PAI-P-531531

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