機器
airborne
aviation
black
camshaft
cooling
cylinder
detail
engine
gearbox
gearing
gears
historic
housing
hydraulic
industrial
industry
iron
mechanic
mechanical
mechanism
metal
old
pipeline
pipes
piston
plans
power
precision
pulley
quality
red
star
star engine
steel
technology
train
transport
transportation
travel
valve
vehicle
vintage
wheel
wheels
workshop