Figure 16.

Main IPC groups. Descriptions from Espacenet website are reported in the following [1]: A61B5: Measuring for diagnostic purposes; Identification of persons; H04L29: Arrangements, apparatus, circuits, or systems, not covered by a single one of groups; G06F3: Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g., interface arrangements; G06Q50: Systems or methods specially adapted for specific business sectors, e.g., utilities or tourism; G06K9: Methods or arrangements for recognizing patterns; G06F17: Digital computing or data processing equipment or methods, specially adapted for specific functions.