機器
aged
ancient
bars
bright
closeup
component
cotter pin
detail
device
dirty
ed
engine
equipment
factory
flywheel
greasy
green
heavy
industrial
industry
iron
lubrication
machinery
mechanism
metal
object
old
paint
part
pipe
plant
power
pressure
retro
rods
round
stem
system
technology
texture
tube
unknown
used
vintage
wheel
workshop