機器
abstract
apparatus
background
black
brand
car
closeup
cog
cogwheel
connection
design
engineering
factory
frame
gear
gears
gearwheel
grunge
history
industrial
industry
iron
machinery
many
mechanical
mechanics
mechanism
metal
new
order
part
pattern
plant
press
shaft
shafts
spare
spur
steel
teeth
texture
train
transmission
wheel