GS0091: COMPUTER HARDWARE AND NETWORKING HARDWARE FOR USE IN THE FIELD OF TELECOMMUNICATIONS AND DATA NETWORKING; COMPUTER SOFTWARE FOR USE IN CONNECTING TELECOMMUNICATIONS AND GLOBAL COMPUTER NETWORKS
GS0371: INSTALLATION, MAINTENANCE AND REPAIR SERVICES, NAMELY, PROVIDING INSTALLATION, MAINTENANCE AND REPAIR SERVICES TO CUSTOMERS IN THE FIELD OF TELECOMMUNICATIONS AND DATA NETWORKING
GS0411: EDUCATIONAL SERVICES, NAMELY, CONDUCTING SEMINARS, WORKSHOPS AND CLASSES IN THE FIELD OF TELECOMMUNICATIONS AND DATA NETWORKING
GS0421: DESIGN AND SUPPORT SERVICES, NAMELY, DESIGNING TELECOMMUNICATION NETWORKS AND DATA NETWORKS FOR OTHERS, PROVIDING TECHNICAL SUPPORT SERVICES TO OTHERS IN THE FIELD OF TELECOMMUNICATIONS AND DATA NETWORKING