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Clarence W. Johnson

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Casing hanger

E - Fixed Constructions – 21 – B
Patent

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Check writer

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Patent

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Differential pressure sensing pilot

G - Physics – 01 – L
Patent

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Floating cushion sub

E - Fixed Constructions – 21 – B
Patent

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Mobile drilling apparatus

E - Fixed Constructions – 21 – B
Patent

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Differential pressure sensing pilot

G - Physics – 01 – L
Patent

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Polish rod rotator

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Patent

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Safety valve actuator

F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent

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Profile ID: LFCA-PAI-P-180597

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