Two men placing a large copper pot over an open fire in slow motion
The wide window in the house is open for ventilation. Man open windows
Man working with a large copper pot over an open flame in slow motion in his workshop
Elevator doors open
The window in the house is open for ventilation
Closeup hand open book
Small business owner showcasing open sign in creative office. Open leather workshop. Startup business sign open. New working day in small shop. Entrepreneur starting business.
Man adjusting the fire in a wooden blast furnace with a metal poker while heating a large copper pot
Hardening of machine parts in the furnace under high temperature. Large Steel Works. Rolled metal factory
Hardening of machine parts in the furnace under high temperature. Large Steel Works. Rolled metal factory
Hardening of machine parts in the furnace under high temperature. Large Steel Works. Rolled metal factory