An accessible calculator, designed and adapted by James Swail of the NRC around 1975 that converted the visual digital display through an auditory and tactile board.
Picht braille-writer c.1900, first developed by Oscar Picht, director of the Provincial School for the Blind in Bromberg, Germany, and later director of the State Blind Institute Berlin-Steglitz. First manufactured in 1899 by the company B.R. Herde…