Bookbinding machines for industrial purposes; machines for making books, namely, industrial sewing machines, industrial sewing machines that sew book blocks without blind stitches, industrial paper folding machines, gathering machines, stacking machines, punching machines, perfect-binding machines, face trimmer machines, three-knife trimmer machines, casing-in machines, back-gluing machines, pressing machines all being bookbinding machines for industrial purposes; transport systems, namely, belt conveyors, chain conveyors and roller conveyors, for bookbinding installations; and replacement parts for the aforementioned products