The Provisional Revolutionary Government of the Republic of South Vietnam was a Communist government formed by the National Liberation Front (NLF) in 1969 in opposition to the anti-Communist U.S.-supported Republic of Vietnam. After the fall of Saigon in 1975, the Republic of South Vietnam assumed power and ruled for 15 months.
... gyro will also be accelerated to a smaller extent by the slipping friction.
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. ...