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    View of Mitral valve — Stock Photo
    View of Mitral valve
    Close-up of worker operating the gas cylinder in scrapyard — Stock Photo
    Close-up of worker operating the gas cylinder in scrapyard
    Scuba diving tanks — Stock Photo
    Scuba diving tanks
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Man wearing apron making beer at home brewery — Stock Photo
    Man wearing apron making beer at home brewery
    Human heart with colored pulmonary valve, computer illustration. — Stock Photo
    Human heart with colored pulmonary valve, computer illustration.
    Man lifting wort to make beer at home brewery — Stock Photo
    Man lifting 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
    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 adjusting the valve of a container in beer factory — Stock Photo
    Man adjusting the valve of a container in beer factory
    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
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    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
    Control panel american fire truck — Stock Photo
    Control panel american fire truck
    Aerial view of a pipeline with a value and coupling in a green field, West of Calgary; Alberta, Canada — Stock Photo
    Aerial view of a pipeline with a value and coupling in a green field, West of Calgary; Alberta, Canada
    Cardiopulmonary resuscitation training dummies. — Stock Photo
    Cardiopulmonary resuscitation training dummies.
    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
    Close-up of valve oil barrels in industrial mechanical workshop — Stock Photo
    Close-up of valve oil barrels in industrial mechanical workshop
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    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.
    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
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    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
    3d rendered illustration of diseased heart valve on white background. — Stock Photo
    3d rendered illustration of diseased heart valve on white background.
    Human heart anatomy showing tricuspid valve, cross section illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, cross section illustration.
    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
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    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
    Heart cutout view with pulmonary valve, mitral valve and tricuspid — Stock Photo
    Heart cutout view with pulmonary valve, mitral valve and tricuspid
    Engineer in electric power plant inspecting a electrically controlled valve — Stock Photo
    Engineer in electric power plant inspecting a electrically controlled valve
    Copper beer distillery chamber — Stock Photo
    Copper beer distillery chamber
    Mannequin placed next to industrial pipework — Stock Photo
    Mannequin placed next to industrial pipework
    Construction workers preparing to lift gate valve for water main — Stock Photo
    Construction workers preparing to lift gate valve for water main
    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
    Gas Compression Station on background — Stock Photo
    Gas Compression Station on background
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, 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
    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
    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
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Cropped image of man holding valve of machinery at brewery — Stock Photo
    Cropped image of man holding valve of machinery at brewery
    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
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    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
    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
    Human heart anatomy showing aortic valve, cross section illustration. — Stock Photo
    Human heart anatomy showing aortic valve, cross section illustration.
    Human heart anatomy showing pulmonary valve, digital illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, digital 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
    Painted valves and pipes — Stock Photo
    Painted valves and pipes
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Female power engineer checking pressure transducers at power plant — Stock Photo
    Female power engineer checking pressure transducers at power plant
    Aortic valve, computer illustration. — Stock Photo
    Aortic valve, computer illustration.
    Side view of senior Caucasian male farmer repairing valve pipe on the field in farm on a sunny day — Stock Photo
    Side view of senior Caucasian male farmer repairing valve pipe on the field in farm on a sunny day
    Man wearing apron checking temperature while making beer at home brewery — Stock Photo
    Man wearing apron checking temperature while making beer at home brewery
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.