▁ 1 st ▁of ▁may "), ▁at ▁that ▁time ▁and ▁sold ▁its ▁products ▁under ▁the ▁tra dem ark ▁Bar um . ▁Grad ually ▁it ▁expanded ▁its ▁production ▁and ▁became ▁the ▁mon opol y ▁producer ▁of ▁air ▁tub es ▁( since ▁ 1 9 6 2 ) ▁and ▁the ▁main ▁producer ▁of ▁rub ber ▁convey or ▁bel ts ▁( since ▁ 1 9 5 5 ) ▁in ▁Czech oslov ak ia . ▁It ▁also ▁started ▁to ▁produce ▁tr uck ▁radial ▁t ires ▁in ▁the ▁ 1 9 7 0 s . ▁The ▁company ▁founded ▁its ▁own ▁R & D ▁center ▁in ▁ 1 9 8 7 ▁( now ▁" V ipo ") ▁and ▁provided ▁technical ▁assistance ▁for ▁the ▁construction ▁of ▁rub ber ▁works ▁in ▁India , ▁Indones ia , ▁Eth iop ia , ▁Camb odia , ▁Bur ma , ▁Sy ria , ▁Turkey , ▁Iran ▁and ▁Y ug oslav ia . ▁In ▁ 1 9 9 1 ▁it ▁was ▁turned ▁into ▁a ▁joint - stock ▁company ▁and ▁priv at ization ▁took ▁place ▁ 1 9 9 2 - 1 9 9 4 . ▁The ▁tra dem ark ▁of ▁the ▁products ▁of ▁the ▁company ▁was ▁changed ▁to ▁Mat ador ▁and ▁the ▁firm ' s ▁name ▁was ▁changed ▁to ▁G um ár ne ▁Bar um ▁in ▁ 1 9 9 1 ▁and ▁to ▁Mat ador ▁in ▁ 1 9 9 3 . ▁ ▁The ▁joint ▁vent ure ▁" Cont inental ▁Mat ador " ▁for ▁the ▁production ▁of ▁tr uck ▁t ires ▁was ▁established ▁in ▁P ú