Karl Hassel was awarded a patent for a built-in child car seat in 1985. In 1984, Alec Jeffreys discovered DNA fingerprinting in Leicester, England while studying X-ray films. In 1925, a royal tomb of the Hopewell Indian Mound Builders was unearthed in Ohio containing skeletons of a believed royal family. In 1912, Carl Fisher met with auto industry leaders to promote his idea for the Lincoln Highway. In 1896, the first successful heart muscle surgery was performed in Germany by Ludwig Rehn.