auto

cog

connection

control

cooperation

design

detail

direction

dirty

engineer

equipment

factory

fork

forklift

gear

gears

hand

heavy

hold

industrial

industry

iron

loading

machine

maintenance

mechanic

mechanical

metal

moving

object

old

one

operator

part

pipes

power

production

rotation

rusty

spur

steel

strength

system

technology

tool

tooth

two

vehicle

wheel

work

workshop