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 grandfather H.J. Behrenberg was working full time at Hull Sign & Mfg. Co. In 1926 the Behrenberg family owned Hull Sign & Mfg. Co.
By 1926 they were producing bent glass faces with multi-colors on them. H.J. Behrenberg and his brother W.C. Behrenberg were decorating and bending glass for gasoline advertising faces. In 1948 H.J. Behrenberg became the sole owner.