Crazy Machines Fanpage Board

i cannot get past L16. i have included a screen shot. i have tried everything but no joy. i have visited a number of 'solution pages' but they all seem to be spoilers for another version of this game.

thanks for any help.

In this thread, you can find this solution which should work. The theme looks a bit different on this picture, because The Inventor's Workshop was released as a seperate game in Germany, but nevertheless, it's the correct solution.