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industry screw nut asparagus petroleum blue cold metallurgical heavy industry industry screw screw screw screw screw nut metallurgical

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industry factory metallurgical plant ruhr area duisburg industrial plant chimney high voltage line smoke environmental pollution exhaust dike meadow niederrhein river landscape

6

0

men employee job sparks metallurgical welding weld welder mask metallurgical welding welding welding welding welding welder welder

32

9

iron melt furnace metal hot fire metallurgical molten foundry heat steel safety manual pouring black safety black metal metallurgical foundry foundry foundry foundry foundry

51

8

yunnan kunming peaceful kunming metallurgical college building school

1

0

oil industry cables work energy metallurgical plant machinery technology

7

1

man metal works steel works human person male people helmet construction worker labour safety labor employee hot metal metallurgy tool foundry iron industrial metallurgical factory fire

20

8

iron melt furnace metal hot fire metallurgical molten foundry heat steel safety liquid pouring black safety black metal foundry foundry foundry foundry foundry

49

5

screw industry nut asparagus petroleum blue cold metallurgical heavy industry screw nut metallurgical metallurgical metallurgical metallurgical metallurgical

10

4