機器
accuracy
apparatus
black and white
business
closeup
cooperation
detail
drive
dynamics
employment
equipment
force transmission
gear
gear wheel
gears
gull
historic
historical art
industrial installation
industrial plant
industrial revolution
industry
iron
jobs
machine component
machine part
machine tool
mechanic
mechanical
mechanics
mechanism
metal
motion
old
old technique
old technology
outdated
power transmission
precision
ring gear
robust
serrated
sprocket wheel
steel
strength
technology
teeth
together
togetherness
toothed
toothed ring
transmission
turn
utensil