Stock Photo - Specialist lecturer and Master Craftman for plumbing student in the heating, ventilating, and air conditioning, HVAC laboratory, controlling an oil heater, Master Craftman School of the Chamber of Small Industries and Skilled Trades, Dusseldorf, North Rhine-Westphalia, Germany, Europe

Stock Photo: Specialist lecturer and Master Craftman for plumbing student in the heating, ventilating, and air conditioning, HVAC laboratory, controlling an oil heater.

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