Before revision: History The barrel, originally called "Aqua Roller", was the brainchild of two engineers , Pettie Petzer , and Johan Jonker of South Africa .MediaClubSouthAfrica: Tapping into Ingenuity, retrieved 27 September 2008.
After revision: History The barrel originally called "Aqua Roller", was the brainchild of two engineers , Pettie Petzer , and Johan Jonker of South Africa .MediaClubSouthAfrica: Tapping into Ingenuity, retrieved 27 September 2008.