機器
antique
business
carving
close
cog
cogwheel
corroded
design
dirty
drilling
engine
engineering
equipment
fabrication
factory
fittings
gear
gearing
green
grinding
grunge
industrial
industry
iron
lathe
lubrication
machinery
make
mechanical
mechanics
mechanism
metal
monochrome
old
part
pinion
power
retro
rust
steel
technology
transmission
up
vintage
wheel
white
worm
wormgear
yellow