Sylwia Chełstowska, Firma usługowo-szkoleniowa

86.90.E - Other human health activities notelsewhere classified

72.11.Z - Research and experimental development on biotechnology

72.19.Z - Other research and experimental development on natural sciences and engineering

74.30.Z - Translation and interpretation activities

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

85.59.B - Other out-of-school forms of education, not elsewhere classified