This system of machines is used to produce a planetary gearbox used to drive an oscillating sprinkler that uses water flow as it's power source.  The Gearbox contains 24 separate parts of 12 different types.  The exploded view shows how all of the parts fit together.  The system is composed of  3 Sub Assembly Machine, 1 Final Assembly Machine and 1 Test Machine.  The system is fully automatic, so all parts are fed from vibratory feeder bowls and are equipped with hoppers.  The system is made up of  several sub assembly machines feeding one final assembly machine.  This was done because the sheer number of parts in the complete assembly would make it very difficult to achieve a high assembly efficiency. If all of the parts were loaded on one machine, any failure to load any part would result in an incomplete assembly.