air

appliance

barometer

blow

closeup

compressor

descent

detail

device

dial

equipment

factory

flat

gas

gauge

generation

indicator

industrial

industry

instrument

isolated

liquid

machine

machinery

manometer

metal

meter

metering

object

people

physical

pipe

plant

power

pressure

pressurize

pump

scale

service

steel

structure

system

technical

technology

the

tool

tube

valve

white

work

workshop