ball

boiler

brick

circulation

clipboard

clothes

controlling

down

engineer

engineering

equipment

examining

female

gate

headset

heating

helmet

indications

industrial

industry

inspection

inspector

look

maintenance

male

man

manometer

measuring

network

node

pipeline

pipes

plumber

power

pressure

repairman

room

speak

system

technician

technology

thermal

valve

verification

water

woman

work

worker

write

young