installation, maintenance, and repair, for others, of the following - physical cable and optical fiber plants and information technology systems and telecommunications systems used for informational, communication, and entertainment purposes; environmental systems including heating, ventilation, and air conditioning (HVAC) systems; electrical systems; video, video intercom, and intercom systems; security and surveillance systems and equipment, building equipment monitoring systems, head-end systems, and alarm systems and equipment; burglar, intruder, and fire alarm systems, closed circuit television surveillance and hold-up alarm systems, and photographic alarm systems; global computer network systems, interactive systems, and computer systems; electronic systems and equipment; cable television systems and equipment, digital satellite systems and equipment, digital satellite television systems and equipment, direct broadcast satellite systems, satellite master antenna television systems, and satellite communications systems and equipment; computer systems, controls, sensors, software and equipment and computer systems, controls, sensors, software and equipment that drive, monitor, automate, modulate and control HVAC systems, environmental systems, electronic systems, electrical systems, information technology systems, physical cable and optical fiber plants, telecommunications systems, video systems, video intercom systems, audio intercom systems, intercom systems, cable television systems, digital satellite systems, digital satellite television systems, direct broadcast satellite systems, satellite cable television systems, satellite communications systems and equipment, and security, surveillance, and alarm systems; mechanical, electrical, electromechanical and electronic control systems for residential, commercial, institutional, industrial, governmental and retail buildings that drive, monitor, automate, modulate, and enhance environmental and HVAC systems, security and surveillance systems, building automation systems, property management systems, building maintenance systems, computer systems, and industrial and commercial process systems; construction, maintenance and repair of commercial, residential, institutional, governmental, industrial, and retail buildings

telecommunications and information technology services, namely, electronic transmission via wireline and wireless technologies of voice, data, information and multi-media information; providing telecommunications connections to local and global computer networks; toll free telephone services; local, regional, long distance, and international long distance telephone communication services; call waiting, call forwarding, call conferencing, caller identification, facsimile transmission; video on demand transmission services, video and audio teleconferencing, interactive television broadcasting; telephone voice messaging and wireless digital messaging services; and radio, television and satellite transmission and reception services

custom manufacture of physical cable and optical fiber plants and telecommunications and information technology systems used for informational, communication, and entertainment purposes; custom manufacture of environmental systems including heating, ventilation, and air conditioning (HVAC) systems; electrical systems; video, video intercom, and intercom systems; security and surveillance systems and equipment, building equipment monitoring systems, head-end systems, and alarm systems and equipment; burglar, intruder, and fire alarm systems, closed circuit television surveillance and hold-up alarm systems, and photographic alarm systems; global computer network systems, interactive systems, and computer systems; electronic systems and equipment; cable television systems and equipment, digital satellite systems and equipment, digital satellite television systems and equipment, direct broadcast satellite systems, satellite master antenna television systems, and satellite communications systems and equipment; computer systems, controls, sensors, software and equipment and computer systems, controls, sensors, software and equipment that drive, monitor, automate, modulate and control HVAC systems, environmental systems, electronic systems, electrical systems, information technology systems, physical cable and optical fiber plants, telecommunications systems, video systems, video intercom systems, audio intercom systems, intercom systems, cable television systems, digital satellite systems, digital satellite television systems, direct broadcast satellite systems, satellite cable television systems, satellite communications systems and equipment, and security, surveillance, and alarm systems; mechanical, electrical, electromechanical and electronic control systems for residential, commercial, institutional, industrial, governmental and retail buildings that drive, monitor, automate, modulate, and enhance environmental and HVAC systems, security and surveillance systems, building automation systems, property management systems, building maintenance systems, computer systems, and industrial and commercial process systems

research, product development and design, for others, of the following - physical cable and optical fiber plants and information technology systems and telecommunications systems used for informational, communication, and entertainment purposes; environmental systems including heating, ventilation, and air conditioning (HVAC) systems; electrical systems; video, video intercom, and intercom systems; security and surveillance systems and equipment, building equipment monitoring systems, head-end systems, and alarm systems and equipment; burglar, intruder, and fire alarm systems, closed circuit television surveillance and hold-up alarm systems, and photographic alarm systems; global computer network systems, interactive systems, and computer systems; electronic systems and equipment; cable television systems and equipment, digital satellite systems and equipment, digital satellite television systems and equipment, direct broadcast satellite systems, satellite master antenna television systems, and satellite communications systems and equipment; computer systems, controls, sensors, software and equipment and computer systems, controls, sensors, software and equipment that drive, monitor, automate, modulate and control HVAC systems, environmental systems, electronic systems, electrical systems, information technology systems, physical cable and optical fiber plants, telecommunications systems, video systems, video intercom systems, audio intercom systems, intercom systems, cable television systems, digital satellite systems, digital satellite television systems, direct broadcast satellite systems, satellite cable television systems, satellite communications systems and equipment, and security, surveillance, and alarm systems; mechanical, electrical, electromechanical and electronic control systems for residential, commercial, institutional, industrial, governmental and retail buildings that drive, monitor, automate, modulate, and enhance environmental and HVAC systems, security and surveillance systems, building automation systems, property management systems, building maintenance systems, computer systems, and industrial and commercial process systems; and integration of computer systems and networks