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    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    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
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    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
    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
    Metal fermentation valves in rows — Stock Photo
    Metal fermentation valves in rows
    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
    Human heart anatomy showing bicuspid valve, illustration. — Stock Photo
    Human heart anatomy showing bicuspid valve, illustration.
    Female power engineer checking valve at power station — Stock Photo
    Female power engineer checking valve at power station
    Valve on beer worts to make beer at home brewery — Stock Photo
    Valve on beer worts to make beer at home brewery
    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
    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
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    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.
    Close-up of gas cylinders in garage — Stock Photo
    Close-up of gas cylinders in garage
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    Human heart anatomy showing pulmonary valve, digital illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, digital illustration.
    Dried marijuana flower buds on table with analytical balance and moisture measuring device in lab — Stock Photo
    Dried marijuana flower buds on table with analytical balance and moisture measuring device in lab
    Side view of positive young lady in lab coat checking valves on piping system in industrial facility — Stock Photo
    Side view of positive young lady in lab coat checking valves on piping system in industrial facility
    Mechanic checking a car parts in repair garage — Stock Photo
    Mechanic checking a car parts in repair garage
    Side view of crop male worker in mask washing valve of metal tank at work in brewing company during pandemic — Stock Photo
    Side view of crop male worker in mask washing valve of metal tank at work in brewing company during pandemic
    Contemporary kitchen with stoves under hood against wall reflecting house in daytime — Stock Photo
    Contemporary kitchen with stoves under hood against wall reflecting house in daytime
    Close-up view of male farmer repairing valve pipe in farm on a sunny day — Stock Photo
    Close-up view of male farmer repairing valve pipe in farm on a sunny day
    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
    Partial view of oil storage tank. — Stock Photo
    Partial view of oil storage tank.
    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
    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.
    Closeup view of one grilled scallop on shell — Stock Photo
    Closeup view of one grilled scallop on shell
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Copper beer distillery chamber — Stock Photo
    Copper beer distillery chamber
    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
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room
    Human heart with colored pulmonary valve, computer illustration. — Stock Photo
    Human heart with colored pulmonary valve, computer illustration.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Human heart anatomy showing pulmonary valve, illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, illustration.
    Worker closing the cylinder tap in scrapyard — Stock Photo
    Worker closing the cylinder tap in scrapyard
    View of Heart valves — Stock Photo
    View of Heart valves
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    Human heart with colored tricuspid valve, computer illustration. — Stock Photo
    Human heart with colored tricuspid valve, computer illustration.
    Man adjusting the valve of a container in beer factory — Stock Photo
    Man adjusting the valve of a container in beer factory
    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
    Human heart anatomy showing tricuspid valve, cross section illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, cross section illustration.
    Dried marijuana flower buds on table with analytical balance and moisture measuring device in lab — Stock Photo
    Dried marijuana flower buds on table with analytical balance and moisture measuring device in lab
    Overhead view of valve covers, rockers, and heads in a mechanics shop — Stock Photo
    Overhead view of valve covers, rockers, and heads in a mechanics shop
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    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.
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    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
    Aortic valve, computer illustration. — Stock Photo
    Aortic valve, computer illustration.
    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
    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
    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
    Cropped image of man holding valve of machinery at brewery — Stock Photo
    Cropped image of man holding valve of machinery at brewery
    Engineer in electric power plant inspecting a electrically controlled valve — Stock Photo
    Engineer in electric power plant inspecting a electrically controlled valve