In the 1970s, the Pittsburgh Brewing Company acquired the Queen City Brewing Company (1901–1976) of Cumberland, Maryland. The Queen City Brewing Company was also known as the Old German Brewing Company and included the Cumberland Brewing Company (1890–1958), which was purchased by the brewery in 1958. At its peak, the Queen City brewery produced over 250,000 barrels of beer a year in Cumberland. The company prospered during the 1950s and 1960s; however, labor disputes and declining sales caused the Queen City Brewing Company to close in December 1974, transferring its Old German, Old Export, Heritage House, Old Dutch, Brown Derby, Gamecock Ale, and American brands to the Pittsburgh Brewing Company. The Queen City brewery was demolished in April 1975, ending a combined 152 years of brewing in Cumberland, Maryland. In January, 1974, the Pittsburgh Brewing Company acquired the Augustiner, Mark V, Robin Hood and Gambrinus brand names from August Wagner Breweries, Inc., Columbus, Ohio.