Installation of telecommunication networks, installation of communication equipment, maintenance and repair of communication equipment; installation and repair of telecommunication equipment, including disinfecting telephone sets; installation, repair and maintenance of submarine cables, aerial power transmission wire, communication equipment for use in buildings, telecommunication for control in building, telecommunication systems, telecommunication equipment for use in buildings, telecommunication facilities, data communication facilities, and computer systems; underground construction of telephone line; providing information relating to construction projects; supervision and consultation in the field of construction and civil engineering works; maintenance of electrical facilities installed in buildings, and maintenance of building facilities

Treatment of materials, namely, metal treatment, treatment of paper, gum, plastics, food, lumber, stones and ceramics; heat treatment, coating of plastics, electroplating of metals; drying, dyeing, fireproofing, permanent press, bleaching, deodorizing, pre-shrinking, waterproofing and moth proofing of cloth, clothing and lumber; material treatment information in the field of metal treatment, treatment of metal treatment, treatment of paper, gum, plastics, food, lumber, stones and ceramics; heat treatment, coating of plastics, electroplating of metals; drying, dyeing, fireproofing, permanent press, bleaching, deodorizing, preshrinking, waterproofing and moth proofing of cloth, clothing and lumber