In 1893 Fallesen & Berry (wagon makers) is bought out by the Mack brothers after Jack Mack had started work with them in 1890. William Mack, who had been running a wagon building business in Pennsylvania joins his brothers in 1894, and they begin to concentrate only on wagon building. After years of experimentation with motorised wagons in 1905 Mack opened a new factory in Pennsylvania. The business branched into building buses and fire engines. The Mack L-Series was produced from 1940 to 1956, except for the War years, around 27,000 L-Series were sold, the LF and LH being lighter trucks, and LJ and LM heavier Macks. The Mack B-Series was produced from 1953 to 1966 with 126,745 sold. 47,500 Mack B61s were sold