The History of Behrenberg Glass Co.In 1923 A.H. Behrenberg and W. Frank Hull were making signs for the Pittsburgh Brewing Co. W. Frank Hull also had a hand-painted art and design company. In 1923 they incorporated, the company name was Hull Sign & Mfg. Co. Later that year, they started making gasoline signs for the gasoline pumps. By 1925 my gr...