automobile
benzine
boiler
business
car
color
construction
control
diesel
energy
engineer
fill
fix
fuel
gas
gasoline
hand
heater
heating
home
house
icon
illustration
industrial
industry
line
maintenance
man
natural
oil
person
petrol
petroleum
pipe
power
pump
refinery
service
sign
station
symbol
tank
technician
transportation
valve
vehicle
water
worker