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    Closeup view of one opened scallop on white surface — Stock Photo
    Closeup view of one opened scallop on white surface
    Basement water pipes in Everett, Washington, USA — Stock Photo
    Basement water pipes in Everett, Washington, USA
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Closeup top view of opened scallop on scallop fixed with rubber band — Stock Photo
    Closeup top view of opened scallop on scallop fixed with rubber band
    Gas well valves in gas pipeline in desert of United Arab Emirates. — Stock Photo
    Gas well valves in gas pipeline in desert of United Arab Emirates.
    Array of pipes and valves fitted to production wellhead. — Stock Photo
    Array of pipes and valves fitted to production wellhead.