May Caron, 19, of Marion demonstrates a sound CPR form on a manikin, while New Bedford EMS trainer David Branco explains the practice during a September 21 class held at the Rochester Senior Center under the direction of the Rochester Fire Department. Branco and David Zander also demonstrated the use of a battery-operated, $15,000 CPR machine that last month was used during a cardiac event to save the life of Rochester Fire Chief Scott Weigel