機器
abstract
antique
backdrop
background
bolt
brass
cog
compressor
design
dial
engine
engine room
engineering
gauge
gear
grunge
heavy
industrial
industry
inside
iron
knobs
light
machinery
mechanical
mechanism
metal
mount
nut
old
parts
power
red
retro
revolution
rivets
rusty
science
shabby
spokes
steampunk
steel
tank
technology
texture
traction
valve
vintage
wheel