Bridge inspection crane.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...k_fullsize.jpg
Wind turbine that folds down for maintenance access - GIF
Helicopter power line maintenance - video
Wind turbine inspection helicopter drone - GIF
Power line inspection robot - GIF and video
Inspection drone for inaccessible areas - GIF
Snake arm robot for inspecting tunnel boring machine - GIF