Fire sprinkler and red pipe on white ceiling background
Worker repairing the boiler with the aid of welding
Electrical energy distribution substation in a wastewater treatment plant
Selective focus tube sheet or boiler or plate of heat exchanger closeup texture macro diagonal background full of hard insoluble mineral deposits, salts scale and corrosion. Trypophobia concept.
Mechanical industry, gear-cutting production, manufacture of gears and shafts on a gear-cutting machine with a milling cutter, oil-cooled
Fire sprinkler and red pipe on white ceiling background