. "BC-Series" . . . . "Mack 15-speed triplex (5-speed, 3-speed auxiliary)" . "B-Series" . "Mack 10-speed duplex (5-speed, 2-speed auxiliary)" . . . "Mack 20-speed quadruplex (5-speed, 4-speed auxiliary)" . . . . "Mack B series" . . . . . "1953" . . "Mack B series" . . . . . "Mack B Model" . . . "B series" . . . "1966" . . "''B'' series" . .