914.1 Accidents and Accident Prevention - 902.2 Codes and Standards - 901.1.1 Societies and Institutions - 742.2 Photographic Equipment - 723.2 Data Processing and Image Processing - 723 Computer Software;
Data Handling and Applications - 722.2 Computer Peripheral Equipment - 722.1 Data Storage;
Equipment and Techniques - 718.1 Telephone Systems and Equipment - 716 Telecommunication;
Radar;
Radio and Television - 431.1 Air Transportation;
General;