機器
ancient
cogwheel
corroded
detail
dirty
engine
engineering
equipment
factory
gear
gears
grunge
industrial
industry
iron
lathe
machinery
maintenance
manual
manufacture
manufacturing
mechanic
mechanical
mechanics
mechanism
metal
metallic
milling
old
oldfashioned
power
retro
rotation
round
rusty
sprocket
steel
technology
tool
vintage
wheel
work
workshop