▁in ▁the ▁ 1 9 7 0 s . ▁In ▁ 1 9 7 3 , ▁Ch oi ▁held ▁the ▁rank ▁of ▁ 7 th ▁dan . ▁ ▁In ▁ 1 9 8 0 , ▁Ch oi ▁designed ▁the ▁International ▁Ta ek won - Do ▁Federation ' s ▁( IT F ) ▁tree ▁logo ▁that ▁is ▁worn ▁on ▁the ▁back ▁of ▁every ▁I TF ▁uniform . ▁He ▁att ained ▁the ▁rank ▁of ▁ 8 th ▁dan ▁in ▁ 1 9 8 1 , ▁promoted ▁by ▁H . ▁H . ▁Ch oi , ▁and ▁ 9 th ▁dan ▁in ▁ 2 0 0 2 . ▁ ▁Ch oi ▁has ▁started ▁a ▁campaign ▁to ▁reun ite ▁I TF ▁pract ition ers ▁across ▁the ▁world . ▁He ▁continues ▁to ▁teach , ▁conduct ▁grad ing ▁tests , ▁give ▁sem in ars , ▁and ▁offer ▁assistance ▁to ▁those ▁involved ▁in ▁ta ek w ondo . ▁ ▁See ▁also ▁ ▁List ▁of ▁ta ek w ondo ▁grand master s ▁ ▁References ▁ ▁External ▁links ▁ ▁T ae ▁K won ▁Do ▁P ione ers ▁▁▁▁ ▁Category : L iving ▁people ▁Category : H istor ians ▁of ▁mart ial ▁arts ▁Category : Mart ial ▁arts ▁school ▁found ers ▁Category : S ports people ▁from ▁V ancouver ▁Category : S outh ▁Korean ▁male ▁ta ek w ondo ▁pract ition ers ▁Category : S outh ▁Korean ▁male ▁kar ate ka ▁Category : 1 9 4 1 ▁birth s <0x0A> </s> ▁Ober lo is dorf ▁( , ▁) ▁is ▁a ▁town ▁in ▁the ▁district