Samuel Morse
In addition to the telegraph, Morse invented a marble-cutting machine that could carve three-dimensional sculptures in marble or stone. He could not patent it, however, because of an existing 1820 Thomas Blanchard design.
David Brooks (inventor)
Prior to the invention, Brooks worked for the Pennsylvania Railroad, which in the 1850s received permission to build its own telegraph line, having bought necessary patents. Brooks was the railroad's first superintendent of telegraphs, appointed in 1852.