boiler

bolt

butter

chemical

conduit

control

detail

device

drain

energy

engine

engineering

equipment

factory

faucet

fittings

fuel

gas

hydraulics

industrial

industry

manufacture

manufacturing

margarine

metal

oil

petrol

petroleum

pharmacy

pipe

pipeline

plumbing

power

pressure

production

pump

refinery

sewerage

steam

steel

stopcock

sunflower

system

tap

technology

tube

valve

water

workplace