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Diver attaching regulator to scuba tank during pre-dive check on boat
Serious electrical engineer in uniform and helmet inspects an electrical switchboard or control panel in an industrial environment. The man writes down the data on a tablet. Industrial electrical
Boiler with temperature regulator for heating cold water. Red light indicator comes on - boiler works to heat the water. Boiler heats water from cold water supply system
African American man setting down gas bottle and hooking up hose for grill

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