Abstract: A selection machine and process for fine particulate material such as, for example, semolina wheat or other food or industrial products in powdery or granular form, where the particulate material is distributed on a continuous mobile support, is transported from the support to a scanning station for the identification in the particulate material, of undesirable parts thereof, and their position on the support, and, subsequently, to a sorting station having a photoconducting element that can be moved in synchronism with the support and on which photoconducting element is formed a latent image of electrostatic charges, corresponding to the position of the undesirable parts, which electrostatic charges separate the undesirable parts from the desired particulate material by electrostatic attraction.

Abstract: Process for producing shoe soles of injected plastics material, which soles have an empty chamber visible through a transparent material, which process comprises the following steps:a) injection, into a hollow region comprised between a mobile die and a first removable plate, of a multipart tread sole, with at least one of said sole parts being made from a transparent material;b) injection, into a region comprised between said first removable matrix and a second, removable matrix, of a shaped body comprising a perimetrical wall 13 and a top wall 14;c) removal of said first matrix and injection, into the hollow region comprised between said tread sole and said shaped body, of a layer 17 made of a material suitable for bonding the shoe sole and said shaped body to each other;d) removal of said second matrix and injection, into the hollow region comprised between the vamp, the tread sole and the external side of said shaped body, of a material which constitutes the intersole;e) possible either partial or total f