4. Tools
  5. Wrench, screwdriver, or driver therefor
  6. Machine

Henry L. Ehrlich

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Anti-rotational cementing apparatus

Wells – Pistons – fluid driven into well – With stop
Patent

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Cementing against evaporites

Wells – Processes – Cementing – plugging or consolidating
Patent

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Chemical blending system

Patent

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Drilling technique

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Dual string backup tong

Tools – Wrench – screwdriver – or driver therefor – Machine
Patent

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Profile ID: LFUS-PAI-P-320340

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