4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Fluid rotary type

Engineering Enterprises Inc.

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Bladder pump assembly

Pumps – Expansible chamber type – Inlet and discharge distributors at opposite ends of tubular...
Patent

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By-pass tool

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – With longitudinally spaced valve seats
Patent

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Explosion-proof box for electrical components

Equipment for production – distribution – or transformation of ene – Energy conversion or transformation
Patent

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Pump control circuit

Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent

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Seal assembly

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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