The development of Bas 90 started in the 1970s and began implementation in the 1980s .
The development of Bas 90 started in the 1970s and began being implemented in the 1980s .
The development of Bas 90 started in the 1970s and began being implemented in the 1980s .
Reescribe la oración con una redacción diferente: The development of Bas 90 started in the 1970s and began implementation in the 1980s . Producción: