in machines in which the working piece is maintained in contact with the working tools solely by means of rolls

Full Title

Manufacture of leather; Machines or devices therefor > Fleshing, unhairing, samming, stretching-out, setting-out, shaving, splitting, or skiving skins, hides, or leather > using slicking, scraping, or smoothing-out cylinders or blades fixed on supports, e.g. cylinders, in a plane substantially at right angles to the working surface > in machines in which the working piece is maintained in contact with the working tools solely by means of rolls