These drawings are copied at the press on their date into a copy book or reproduced by transfer onto a special register formed from sheets of bubble paper to be stitched thin enough so that they cannot contain any scratching or overprinting; these registers are endorsed and stamped, before use, by the National Institute of Industrial Property under the conditions determined by ministerial order.
The documents thus copied or reproduced must occupy only one side of a sheet of one of the registers or, if the dimensions so require, both sides of two sheets facing each other.