OptoNet Communication, spol. s r.o. (27750132)OPTOKON Kable Co., Ltd., s.r.o. (03946487)OPTOKON, a.s. (13692283)Ing. JIŘÍ ŠTEFLGOLDENJEST International, a.s.Ing. Jiří ŠteflOPTOKON, a.s.OPTOKON, a.s.Ing. Jiří ŠteflGOLDENJEST International, a.s.Ing. Jiří Štefl