aluminum
アルミニウム
air
artisan
blue
boiler
ceiling
central
check
checking
clean
coal fired
colleagues
conditioning
conduit
craftsman
employees
fuel
heating
heating specialist
helmet
hose
jumpsuite
layout
men
metallic
pipe
plan
plumber
repairman
skills
steam
stepladder
technician
tiles
tube
verify
wall
watch
workers
works