4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Combined with earth removal
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Convertible vibratory or rotary core drill apparatus

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent

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Core drilling method and apparatus

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Reexamination Certificate

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Core sampler apparatus with specific attachment means

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent

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Core sampling method and core sampler therefor

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Corer-grinder

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Reexamination Certificate

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Coring bit and method for obtaining a material core sample

Boring or penetrating the earth – Boring without earth removal – Combined with earth removal
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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