The gps (1 ene 1990 año – 24 sept 1992 año)
Descripción:
In 1995 was when the gps was first optional. It was made by Ivan A. Getting, Roger L. Easton,and Bradford Parkinson. But it first became public in 2000.
Añadido al timeline:
fecha:
1 ene 1990 año
24 sept 1992 año
~ 2 years and 8 months