accuracy

blue

busy

central

complex

construction

control

efficiency

electromotor

energy

equipment

fabricator

factory

fuel

gas

gauge

generation

heat

heating

helmet

indoor

industry

instrument

looking

machine

machinist

manual

manufacturing

measurement

metal

modern

nobody

occupation

part

physical

pipe

pipeline

plant

power

pressure

protective

pump

refinery

residential

room

safety

station

supply

twisted

water