#levy-type

Other inventions followed, including the engraved glass grating known as the Levy line screen. Invented in 1887, these were the first commercial halftone screens, which became universally used for producing half-tone photoengravings, and are still an industry standard to this day. This innovation was followed by the acid blast, or etching machine, in 1897 and the etch-powdering machine in 1901. In 1900, the firm was renamed the Graphic Arts Company, and the brothers added a printing and publishing department to their business.

Outside of their work in the photography industry, the brothers were prominent members of the Philadelphia Jewish community. Most notably, Louis was the founding president of the Association for the Protection of Jewish Immigrants, known today as HIAS Pennsylvania, and wrote extensively on immigration related issues.