4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Combined with earth removal

Ivan L. Ericson

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A method of coating a layer of an yttrium vanadate phosphor cont

Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent

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Abrasion resistant silicon nitride based articles

Abrasive tool making process – material – or composition – With inorganic material – Metal or metal oxide
Patent

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Abrasion resistant silicon nitride based articles

Abrasive tool making process – material – or composition – With inorganic material
Patent

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Alumina coated composite silicon aluminum oxynitride cutting too

Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent

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Alumina coated composite silicon nitride cutting tools

Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent

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