機器
abstract
aged
antique
auto
automobile
block
bolt
cable
car
closeup
connection
detail
diesel
dirty
electric
energy
engine
equipment
filter
gas
generator
grunge
industrial
industry
iron
machinery
mechanic
mechanical
metal
motor
oil
old
part
pipe
piston
power
repair
retro
rusty
steel
system
technology
transportation
truck
tube
valve
vehicle
vintage