Application of Parallelogram Mechanism 09 April 2021, 19:41 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! Self-adjusting step ladder for wharfs. The steps remain horizontal whatever the water level rises or falls. « previous mechanism Friction Roller Drive next mechanism » Wood D Copy Milling Machine load comments Please enable JavaScript to view the comments.