Stock Photo: Bell Telephone Company, America. Top left: Winding and inspecting coils. Top right: Experimental deparment. Centre right: First Bell telephone and First Boston telephone exchange with 5 lines (1877). Centre: Inspecting department. Centre Right: Hand telephone department. Bottom Left: Boston Telephone Exchange, 1884. Bottom Right: Assembling Transmitters. Engraving from Scientific American (September 20, 1884)