機器
abstract
accessories
alloy
ancient
antique
apparatus
art
bearing
closeup
cog
concept
connector
crankshaft
creative
design
detail
engineering
factory
garage
gear
grunge
industrial
industry
iron
ironworks
machinery
mechanical
mechanics
mechanism
metal
metallic
object
old
part
parts
repair
rusty
steel
technology
tooth
transmission
vintage
workshop