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    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    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
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Human heart anatomy showing mitral valve, digital illustration. — Stock Photo
    Human heart anatomy showing mitral valve, digital illustration.
    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 with colored pulmonary valve, computer illustration. — Stock Photo
    Human heart with colored pulmonary valve, computer illustration.
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Human heart anatomy showing tricuspid valve, digital illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, digital illustration.
    Cropped image of man holding valve of machinery at brewery — Stock Photo
    Cropped image of man holding valve of machinery at brewery
    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
    Heart cutout view with pulmonary valve, mitral valve and tricuspid — Stock Photo
    Heart cutout view with pulmonary valve, mitral valve and tricuspid
    Human heart with colored tricuspid valve, computer illustration. — Stock Photo
    Human heart with colored tricuspid valve, computer illustration.
    Construction workers preparing to lift gate valve for water main — Stock Photo
    Construction workers preparing to lift gate valve for water main
    Human heart anatomy showing tricuspid valve, cross section illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, cross section illustration.
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Mannequin placed next to industrial pipework — Stock Photo
    Mannequin placed next to industrial pipework
    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
    Cardiopulmonary resuscitation training dummies. — Stock Photo
    Cardiopulmonary resuscitation training dummies.
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation 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
    Engineer in electric power plant inspecting a electrically controlled valve — Stock Photo
    Engineer in electric power plant inspecting a electrically controlled valve
    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
    Various metal containers placed near shabby building wall and water tap on street of town in Gambia — Stock Photo
    Various metal containers placed near shabby building wall and water tap on street of town in Gambia
    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
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Indoors view of Pumps in a water treatment plant — Stock Photo
    Indoors view of Pumps in a water treatment plant
    Millennial man and father in law working on old classic car together — Stock Photo
    Millennial man and father in law working on old classic car together
    Dried marijuana flower buds on table with analytical balance and moisture measuring device against protective glasses in lab — Stock Photo
    Dried marijuana flower buds on table with analytical balance and moisture measuring device against protective glasses in lab
    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
    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
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Valve on beer worts to make beer at home brewery — Stock Photo
    Valve on beer worts to make beer at home brewery
    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
    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
    Metal fermentation valves in rows — Stock Photo
    Metal fermentation valves in rows
    Aortic valve, computer illustration. — Stock Photo
    Aortic valve, computer illustration.
    Anatomy of heart interior with labels — Stock Photo
    Anatomy of heart interior with labels
    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
    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
    Medical illustration of human heart interior — Stock Photo
    Medical illustration of human heart interior
    Painted valves and pipes — Stock Photo
    Painted valves and pipes
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    3d rendered illustration of diseased heart valve on white background. — Stock Photo
    3d rendered illustration of diseased heart valve on white background.
    Close-up of gas cylinders in garage — Stock Photo
    Close-up of gas cylinders in garage
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Female power engineer checking injectors with compressed gas at power station — Stock Photo
    Female power engineer checking injectors with compressed gas at power station
    Gas Compression Station on background — Stock Photo
    Gas Compression Station on background
    Closeup view of one grilled scallop on shell — Stock Photo
    Closeup view of one grilled scallop on shell
    Portrait of a confident man wearing apron standing at home brewery — Stock Photo
    Portrait of a confident man wearing apron standing 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
    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.
    View of Mitral valve — Stock Photo
    View of Mitral valve
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Close-up of valve of oil gallon in industrial workshop — Stock Photo
    Close-up of valve of oil gallon in industrial workshop
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room