background
black
bolt
business
construction
control
design
drain
element
energy
engineering
equipment
factory
faucet
fuel
gas
gasoline
icon
illustration
industrial
industry
isolated
line
metal
natural
object
oil
outline
pictogram
pipe
pipeline
piping
plumbing
power
pressure
pump
set
sign
silhouette
steel
supply
symbol
system
tap
technology
tube
valve
water
wheel