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    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    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
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Close-up of worker operating the gas cylinder in scrapyard — Stock Photo
    Close-up of worker operating the gas cylinder in scrapyard
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    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
    Worker closing the cylinder tap in scrapyard — Stock Photo
    Worker closing the cylinder tap in scrapyard
    Steel frosted pipe with stopcock covered and fixed with bolt and brought to large stainless steel vessel in light laboratory — Stock Photo
    Steel frosted pipe with stopcock covered and fixed with bolt and brought to large stainless steel vessel in light laboratory
    Man lifting wort to make beer at home brewery — Stock Photo
    Man lifting wort to make beer at home brewery
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    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
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    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
    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.
    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
    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
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Engineer in electric power plant adjusting manual valve in condenser room piping — Stock Photo
    Engineer in electric power plant adjusting manual valve in condenser room piping
    Vintner checking stainless steel vat in winery cellar — Stock Photo
    Vintner checking stainless steel vat in winery cellar
    Man adjusting the valve of a container in beer factory — Stock Photo
    Man adjusting the valve of a container in beer factory
    Mannequin placed next to industrial pipework — Stock Photo
    Mannequin placed next to industrial pipework
    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
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Indoors view of Pumps in a water treatment plant — Stock Photo
    Indoors view of Pumps in a water treatment plant
    Gas Compression Station on background — Stock Photo
    Gas Compression Station on background
    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
    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
    Human heart with colored tricuspid valve, computer illustration. — Stock Photo
    Human heart with colored tricuspid valve, computer illustration.
    Female power engineer checking pressure transducers at power plant — Stock Photo
    Female power engineer checking pressure transducers at power plant
    Gloved hands of foreman working on equipment with valve on factory — Stock Photo
    Gloved hands of foreman working on equipment with valve on factory
    Human heart anatomy showing pulmonary valve, illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, illustration.
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Back view of male engineer taking notes on paper on metal vessel in beer factory — Stock Photo
    Back view of male engineer taking notes on paper on metal vessel in beer factory
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    3d rendered illustration of diseased heart valve on white background. — Stock Photo
    3d rendered illustration of diseased heart valve on white background.
    Stavanger norway oil rig pumps — Stock Photo
    Stavanger norway oil rig pumps
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Valve on beer worts to make beer at home brewery — Stock Photo
    Valve on beer worts to make beer at home brewery
    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
    Shiny metal sink with chrome tap installed near potted plant in contemporary kitchen — Stock Photo
    Shiny metal sink with chrome tap installed near potted plant in contemporary kitchen
    Human heart anatomy showing pulmonary valve, digital illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, digital illustration.
    Closeup view of Abalone mussel with herb on salt — Stock Photo
    Closeup view of Abalone mussel with herb on salt
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section 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
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    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
    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
    Aortic valve, computer illustration. — Stock Photo
    Aortic valve, computer illustration.
    Female power engineer checking valve at power station — Stock Photo
    Female power engineer checking valve at power station
    Copper beer distillery chamber — Stock Photo
    Copper beer distillery chamber
    Heart cutout view with pulmonary valve, mitral valve and tricuspid — Stock Photo
    Heart cutout view with pulmonary valve, mitral valve and tricuspid
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Man holding beer bottle while making beer at home brewery — Stock Photo
    Man holding beer bottle while making beer at home brewery
    Vintner in lab coat and hard hat examining stainless steel vat in cellar — Stock Photo
    Vintner in lab coat and hard hat examining stainless steel vat in cellar
    Closeup view of fried scallops with courgette strips in clam shell — Stock Photo
    Closeup view of fried scallops with courgette strips in clam shell
    Man stirring beer in work while making beer at home brewery — Stock Photo
    Man stirring beer in work while making beer at home brewery
    Gas well valve in gas pipeline in desert of United Arab Emirates. — Stock Photo
    Gas well valve in gas pipeline in desert of United Arab Emirates.