The telautograph, an analog precursor to the modern fax machine, transmits electrical impulses recorded by potentiometers at the sending station to servomechanisms attached to a pen at the receiving station, thus reproducing at the receiving station a drawing or signature made by the sender. It was the first such device to transmit drawings to a stationary sheet of paper;
- possibly EE-49, EE-50, EE-51. evidently their was an outdoor version, and indoor version. the outdoor in a steel box.