The cutting machine sounds a little like Edward Scissorhands doing his thing.
This time, however, the grower is not spraying. On the front end of his tractor is another attachment that holds half a dozen or more rotating blades. As he plies the rows, the spinning blades cut long vine stems from the sides and tops of the plants without touching the precious grape bunches hanging below. If I'm not mistaken, this is a parcel of sauvignon blanc grapes.