機器
antique
background
brown
circle
cog
cogs
cogwheel
concept
corroded
corrosion
decay
design
detail
dirty
drive
engine
engineering
equipment
factory
gear
grunge
industrial
industry
iron
machinery
macro
mechanical
mechanism
metal
object
old
part
pattern
power
retro
round
rust
rusty
scrap
spin
sprocket
steel
technology
tooth
transmission
vintage
wheel
winch
work