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    Indoors view of Pumps in a water treatment plant — Stock Photo
    Indoors view of Pumps in a water treatment plant
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Engineer in electric power plant inspecting manual valve in condenser room piping — Stock Photo
    Engineer in electric power plant inspecting manual valve in condenser room piping
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Human heart anatomy showing tricuspid valve, cross section illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, cross section illustration.
    Man lifting wort to make beer at home brewery — Stock Photo
    Man lifting wort to make beer at home brewery
    Human heart with colored tricuspid valve, computer illustration. — Stock Photo
    Human heart with colored tricuspid valve, computer illustration.
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom — Stock Photo
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom
    Cropped image of man holding valve of machinery at brewery — Stock Photo
    Cropped image of man holding valve of machinery at brewery
    Painted valves and pipes — Stock Photo
    Painted valves and pipes
    View of Heart valves — Stock Photo
    View of Heart valves
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Row of colored metal faucets with valves and pipes transferring hot and cold water on plant — Stock Photo
    Row of colored metal faucets with valves and pipes transferring hot and cold water on plant
    Closeup view of Abalone mussel with herb on salt — Stock Photo
    Closeup view of Abalone mussel with herb on salt
    Close-up of worker operating the gas cylinder in scrapyard — Stock Photo
    Close-up of worker operating the gas cylinder in scrapyard
    Back view of crop unrecognizable male engineer ascending ladder against metal vessel in beer factory — Stock Photo
    Back view of crop unrecognizable male engineer ascending ladder against metal vessel in beer factory
    Cardiopulmonary resuscitation training dummies. — Stock Photo
    Cardiopulmonary resuscitation training dummies.
    Man pouring sack of barley into wort to make beer at home brewery — Stock Photo
    Man pouring sack of barley into wort to make beer at home brewery
    Frozen pipeline valve installed on metal tube transferring liquid nitrogen at oil and gas processing factory — Stock Photo
    Frozen pipeline valve installed on metal tube transferring liquid nitrogen at oil and gas processing factory
    Man lifting wort to make beer at home brewery — Stock Photo
    Man lifting wort to make beer at home brewery
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Human heart anatomy showing aortic valve, cross section illustration. — Stock Photo
    Human heart anatomy showing aortic valve, cross section illustration.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Light bulbs and valve bulbs, X-ray. — Stock Photo
    Light bulbs and valve bulbs, X-ray.
    Front view of senior Caucasian farmer fixing large irrigation water pipe valve in the field at farm — Stock Photo
    Front view of senior Caucasian farmer fixing large irrigation water pipe valve in the field at farm
    Portrait of a confident man wearing apron standing at home brewery — Stock Photo
    Portrait of a confident man wearing apron standing at home brewery
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Millennial man in garage holding a motor head in his hands in sunlight — Stock Photo
    Millennial man in garage holding a motor head in his hands in sunlight
    Engineer in electric power plant inspecting a electrically controlled valve — Stock Photo
    Engineer in electric power plant inspecting a electrically controlled valve
    View of Mitral valve — Stock Photo
    View of Mitral valve
    Partial view of oil storage tank. — Stock Photo
    Partial view of oil storage tank.
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    Row of colored metal faucets with valves and pipes transferring hot and cold water on plant — Stock Photo
    Row of colored metal faucets with valves and pipes transferring hot and cold water on plant
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Valve on beer worts to make beer at home brewery — Stock Photo
    Valve on beer worts to make beer at home brewery
    Man testing temperature of beer in wort while making beer at home brewery — Stock Photo
    Man testing temperature of beer in wort while making beer at home brewery
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Man holding sack of barley into wort to make beer at home brewery — Stock Photo
    Man holding sack of barley into wort to make beer at home brewery
    Mechanic checking a car parts in repair garage — Stock Photo
    Mechanic checking a car parts in repair garage
    Human heart anatomy showing aortic valve, digital illustration. — Stock Photo
    Human heart anatomy showing aortic valve, digital illustration.
    Interior of brewery, large steel pipes, valves and control unit for the brewing process — Stock Photo
    Interior of brewery, large steel pipes, valves and control unit for the brewing process
    Man lifting wort to make beer at home brewery — Stock Photo
    Man lifting wort to make beer at home brewery
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Close-up of valve oil barrels in industrial mechanical workshop — Stock Photo
    Close-up of valve oil barrels in industrial mechanical workshop
    Computer illustration of a blood clot inside vein, known as venous thrombus. — Stock Photo
    Computer illustration of a blood clot inside vein, known as venous thrombus.
    3d rendered illustration of diseased heart valve on white background. — Stock Photo
    3d rendered illustration of diseased heart valve on white background.
    Gloved hands of unrecognizable male master in turning industrial machine valve during work on factory — Stock Photo
    Gloved hands of unrecognizable male master in turning industrial machine valve during work on factory
    Close-up of valve of oil gallon in industrial workshop — Stock Photo
    Close-up of valve of oil gallon in industrial workshop
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Industrial engineer turning valve on pipe at fuel tank at a power plant — Stock Photo
    Industrial engineer turning valve on pipe at fuel tank at a power plant
    Close-up of man fixing valve to beer wort to make beer at home brewery — Stock Photo
    Close-up of man fixing valve to beer wort to make beer at home brewery
    Human heart anatomy showing bicuspid valve, illustration. — Stock Photo
    Human heart anatomy showing bicuspid valve, illustration.
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Glass of barley, flask and beer bottle on beer worts to make beer at home brewery — Stock Photo
    Glass of barley, flask and beer bottle on beer worts to make beer at home brewery
    Human heart anatomy showing pulmonary valve, illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, illustration.
    Close-up of glasses of barley on beer worts to make beer at home brewery — Stock Photo
    Close-up of glasses of barley on beer worts to make beer at home brewery
    Contemporary kitchen with gas and electric stoves under hood against wall reflecting house in daytime — Stock Photo
    Contemporary kitchen with gas and electric stoves under hood against wall reflecting house in daytime