building
business
carbon
chemical
coal
construction
distillery
drilling
eco
electricity
element
energy
engineering
environment
equipment
facility
factory
fuel
gas
gasoline
graphic
heavy
icon
industrial
industry
isolated
leaf
manufacture
manufacturing
object
oil
petrochemical
petrol
petroleum
pictogram
pipe
pipeline
power
powerful
production
refinery
resource
set
smoke
storage
structure
symbol
water