building
business
clipart
complex
construction
contamination
design
dirty
elaborate
electricity
energy
engineering
environment
equipment
factories
factory
fireplace
frame
graphic
heavy
icon
icons
illustration
image
industrial
industrialization
industry
isolated
label
manufacture
metallurgy
object
pictogram
plane
plant
pollution
polution
poster
powers
production
smoke
structure
structures
symbol
tool
towers
work
working