4. Boring or penetrating the earth
  5. Automatic control
  6. Of boring means including a below-ground drive prime mover

Richard M. Pell

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Command and control for boring system

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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System for rapidly boring through materials

Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Combustion is confined chamber having restricted discharge...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2295543

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