(under subclass 210) Devices in which the affirmative holding means operates by reducing the air or other fluid pressure on at least a part of articles to be engaged, the articles being thus affirmatively held thereto by the pressure of surrounding air or other fluid pressure medium.
SEE OR SEARCH CLASS
111, Planting,
179+, and 185+ for bacuum type discharge assistants for dispensers claimed in combination with planting machines.
198, Conveyors: Power-Driven,
428, 438, 449, and 689.1 for a conveyor having a suction type load holder.
294, Handling: Hand and Hoist-Line Implements, 64.1+, for handling, hand and hoist-line implements in which the load engaging means is in the nature of a vacuum-cup element.
