機器
aged
background
bolt
brown
coil
design
detail
dirty
element
factory
faucet
frame
grunge
grungy
hardware
head
heavy
industrial
industry
iron
isolated
mainspring
mechanic
mechanical
metal
metallic
old
part
pinion
pipe
pipeline
plate
plumbing
retro
rough
rust
rusty
screw
set
spare
spiral
spring
steel
texture
tube
valve
weathered
work
worn