I knew of a couple who were both deaf and dumb when I was a child in the late 1940's, but I don't know their names. They lived in the same apartment house in Brooklyn, New York as I did and I remember visiting them a couple of times and being fascinated by their light system. There were light bulbs hung in every room that would flash a few times whenever the doorbell was rung. The wires strung across every room at door top level connected all the lights - sort of a Rube Goldberg affair. They had 2 or 3 children, all of whom were unimpaired. Since I was so young and also did not have frequent contact with them over an extended period, this is the extent of my memory of them.