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    Array of pipes and valves fitted to production wellhead. — Stock Photo
    Array of pipes and valves fitted to production wellhead.
    Top view of oven-baked seasoned scallops on valves and white plate — Stock Photo
    Top view of oven-baked seasoned scallops on valves and white plate
    Closeup view of one opened scallop on white surface — Stock Photo
    Closeup view of one opened scallop on white surface
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Control valves for low and intermediate pressure area flow at electric gas turbine plant — Stock Photo
    Control valves for low and intermediate pressure area flow at electric gas turbine plant
    Painted valves and pipes — Stock Photo
    Painted valves and pipes
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Closeup view of clams shells with fork — Stock Photo
    Closeup view of clams shells with fork