機器
aged
ancient
antique
background
brake pad
building
close
closeup
construction
corroded
corrosion
crank
decay
detail
dirty
engine
equipment
factory
gear
grunge
heavy
historic
industrial
iron
locomotive
machinery
mechanical
metallic
obsolete
old
part
power
retro
rough
round
rust
rusty
shaft
steel
technology
texture
tractor
train
transportation
vehicle
vintage
weathered
wheel
work