organised by Professional Group E9. organised by Professional Group E7. organised by Professional Group Cll. organised by Professional Group S. 3. organised by Professional Groups E12 and E15. organised by professional Group C7 (Control Techniques) organized by the Professional Group on Circuit Theory. organised by the IEE Joint Professional Group (J3), etc. organised by Professional Group C7 (Control Techniques) organised by Professional Group E13 (Optics and Infra-Red).