POLSKIE TOWARZYSTWO CERTYFIKACJI ENERGII

94.11.Z - Activities of commercial organizations and employers' organizations

58.29.Z - Publishing of other software

70.21.Z - Head office activities and management consultancy

70.22.Z - Head office activities and management consultancy

71.12.Z - Engineering activities and related technical consultancy

71.20.B - Inspection and issuing opinions on the technical condition of chimneys and ventilation ducts

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

82.30.Z - Activities related to organizing fairs, exhibitions, and congresses

85.59.B - Courses and training for acquiring knowledge, skills, and professional qualifications in non-school forms