These documents, which cover the years 1864-1919, relate to the career of Joseph Casho, a mechanical engineer who became superintendent of operations at the Pearl Street central station in New York City in August 1882. Included are a printed engineer's certificate from 1864, an 1883 note from Edison introducing London investor Dillwyn Parrish, and a letter about Casho's 1905 elevator patent. Also included is an invitation to an Edison Pioneers function at Llewellyn Park in 1919 to meet Charles Edison and his new wife, Carolyn Hawkins Edison.