Bucyrus-Erie bulldozer and bullgrader work in tandem

Check out a Bucyrus-Erie bulldozer and bullgrader working in tandem. This video was was compiled, narrated and produced by Keith Haddock for the Historical Construction Equipment Association.

[@ShannonFreng]

So, where is the grader (or, for that matter, any narration)? All I saw is a bulldozer.