BartekDera.pl - Usługi Informatyczne i Edukacja mgr inż. Bartłomiej Dera

62.03.Z - Computer facilities management activities

47.41.Z - Retail sale of computers, peripheral units and software in specialised stores

47.91.Z - Retail sale via mail order houses or via Internet

58.19.Z - Other publishing activities

62.09.Z - Other information technology and computer service activities

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