TEL-JON KRZYSZTOF JONIK

71.12.Z - Engineering activities and related technical consultancy

42.12.Z - Works related to construction of railways and underground railways

42.22.Z - Works related to construction of telecommunications and electricity lines

43.21.Z - Electrical installation

43.22.Z - Plumbing, heat and air-conditioning installation

43.99.Z - Other specialised construction activities not elsewhere classified

61.10.Z - Wired telecommunications activities

61.20.Z - Wireless telecommunications activities, excluding satellite telecommunications activities

62.01.Z - Computer programming activities

74.90.Z - Other professional, scientific and technical activities not elsewhere classified

95.12.Z - Repair and maintenance of (tele)communication equipment