機器
abstract
background
chain
closeup
company
connection
construction
design
detail
drum
fastening
gray
grunge
heavy
historic
industrial
industry
iron
link
linked
machinery
material
mechanical
metal
metallic
mica
old
pattern
pulley
robust
rust
rustless
rusty
security
ship
steampunk
steel
strength
technical
texture
vintage
wallpaper
weathered
welded
welded metal
white
wire
workshop
zinc