There is a way you can telephone from every room in a residence, explains the May 1905 issue of Popular Mechanics magazine: https://books.google.com/books?id=oN8DAAAAMBAJ&lpg=PA491&pg=PA502#v=onepage&q&f=false
There is a way you can telephone from every room in a residence, explains the May 1905 issue of Popular Mechanics magazine: https://books.google.com/books?id=oN8DAAAAMBAJ&lpg=PA491&pg=PA502#v=onepage&q&f=false