機器
agriculture
ancient
antique
background
brown
closeup
cog
engineering
europe
gear
gears
gearwheel
gerar
heavy
historical
history
industry
iron
machinery
mechanism
metal
mill
nobody
obsolete
old
pinion
retro
rotate
rotation
round
rusty
shafts
shift
sprocket
spur
steel
tool
tooth
vintage
weathered
wheel
wood
wooden