23 RIVETING MACHINES; RIVETING PRESSES; RIVETING TOOLS; ELECTRO-MAGNETIC CLASSIFYING AND CONVEYING APPARATUS; PART AND FULL AUTOMATIC ASSEMBLY MACHINES AND ELECTRIC AND ELECTRONIC OPERATION CONTROLLERS FOR THE ABOVE MACHINES; CONVEYORS FOR PIECE GOODS AND PARCELS; FULLY-AUTOMATIC STAPLERS FOR BOXES; STAPLE REMOVERS; AND FULLY-AUTOMATIC LOADING AND UNLOADING MACHINES