disassembly
engine
equipment
factory
file
grinder
hand
happy
heavy
helmet
human
indoors
industry
job
labor
laborer
machinery
machinist
maintenance
male
man
manual
mechanic
mechanism
men
metal
motor
person
portrait
power
powerful
protection
repairing
repairman
repairs
safety
steam
steel
technician
technology
tools
troubleshooting
turbine
work
worker
working
workplace
workshop
young