(under the class definition) Device wherein a force, other than a mere frictional force, is utilized to facilitate the grip of a material moving means on the material, the force being exerted in some manner other than (1) the weight of the material itself, or (2) an element opposite the advancing means, which element urges the material against the advancing means.
(1) Note. As indicated by the subclasses indented hereunder, these forces are electrostatic, pneumatic, or the adhesive nature of the material being moved. An example, of a patent left in this subclass (93) is one for a device which utilizes magnetism as the attracting force.
