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John V. Fredd

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E - Fixed Constructions – 21 – B
Patent

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Actuator

E - Fixed Constructions – 21 – B
Patent

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Amplifying recorder for tubing calipers

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Apparatus for and method of operating a well

E - Fixed Constructions – 21 – B
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Dual safety valve installation

E - Fixed Constructions – 21 – B
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Profile ID: LFCA-PAI-P-62315

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