A step of or apparatus for performing an operation of the class type by the application of vibrational energy at frequencies above the range of human hearing (i.e., over, 20,000 hz.).
(1) Note. This digest subclass is intended as an aid to the searcher for locating structure for performing cutting operations by a tool of the class type, or for other operations similar in result, (e.g., drilling holes in a workpiece by application of ultrasonic energy without the use of a rotating, axially moving tool.)
