4. Industrial electric heating furnaces
  5. Arc furnace device
  6. Plural furnace units

Joseph Purcell

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Drill bit assembly for fluid-operated percussion drill tools

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

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Drill bit assembly for fluid-operated percussion drill tools

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate

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Mobile furnace facility

Industrial electric heating furnaces – Arc furnace device – Plural furnace units
Patent

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Paper scoring and slitting machine

Cutting – Processes – With preparatory or simultaneous ancillary treatment of work
Patent

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Percussion hammer for enlarging drilled holes

Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Reexamination Certificate

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Profile ID: LFUS-PAI-P-459830

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