(under the class definition) Apparatus in which an element of the apparatus is operated or controlled by engagement with a work unit, or by a holder for a work unit that is not a part of the apparatus.
SEE OR SEARCH CLASS
126, Stoves and Furnaces,
52, for a cooking stove using liquid or gaseous fuel, the feed valve for which is controlled by the weight of the article being heated.
219, Electric Heating,
518, for an electrical heater the switch for which is responsive to the weight, position of presence of a body to be heated.
228, Metal Fusion Bonding, 9, for a metal fusion bonding apparatus responsive to the presence, absence, size or other condition of the work being bonded.