機器
aged
background
beam
belt
broken
chain
circle
design
detail
dirty
drive
element
engineering
equipment
factory
frame
gear
gray
grunge
hardware
horizontal
industrial
industry
interior
iron
isolated
machinery
mechanic
metal
metallic
mine
motion
motor
movement
old
pulley
rust
rusty
set
steel
structure
texture
tools
transmission
vintage
weathered
wheel
wind
worn