the liquid or other fluent material being supplied from inside the roller

Full Title

Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating (B05C5/02, B05C7/00 take precedence) > for applying liquid or other fluent material to work of indefinite length > using a roller > the liquid or other fluent material being supplied from inside the roller