adjustment
check
diagnosis
disassembly
engine
equipment
factory
hand
happy
heavy
helmet
human
indoors
industry
job
labor
laborer
machinery
machinist
maintenance
male
mechanic
mechanism
men
metal
motor
part
person
portrait
power
powerful
problem
protection
repairman
repairs
safety
spanner
steam
steel
technician
tighten
tools
troubleshooting
turbine
worker
working
workshop
wrench
young