(b)[ "petroleum Class A" means petroleum having a flash-point below twenty-three degrees Centigrade;(bb)"petroleum Class B" means petroleum having a flash-point of twenty-three degrees Centigrade and above but below sixty-five degrees Centigrade;(bbb)"petroleum Class C" means petroleum having a flash-point of sixty-five degrees Centigrade and above but below ninety-three degrees Centigrade;]
