Diskussion:Bifokalglas

Erfinder

Warum nicht Borsch? Literatur:

• "(John) Louis Borsch, Jr., (1893-1926) was born in Philadelphia, PA, the son of a famous optician who had invented rimless spectacles and the first cemented countersunk bifocal."
• "During his lifetime he was probably best known as the inventor of the first fused bifocal lens, which was marketed very successfully as the Kryptok lens." (patentiert 1908)