An unknown buyer acquired 13.9% stake in RTA Laboratuvarlari Biyolojik Urunler Ilac ve Makine Sanayi Ticaret A.S. (IBSE:RTALB) from Mehmet Tayyip Turkaslan on November 16, 2018. An unknown buyer completed the acquisition of 13.9% stake in RTA Laboratuvarlari Biyolojik Urunler Ilac ve Makine Sanayi Ticaret A.S. (IBSE:RTALB) from Mehmet Tayyip Turkaslan on November 16, 2018.