A collection of documents disclosing the use of a rough material that provides a lot of friction, in association with a device, or in constructing at least a portion of a device under the class definition.
(documents; disclosing; the use of a rough material) (a rough material; provides; a lot of friction, in association with a device, or in constructing at least a portion of a device under the class definition)
documents a rough material
disclosing provides
the use of a rough material
a lot of friction, in association with a device, or in constructing at least a portion of a device under the class definition