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I installed and repaired teleautograph machines.

From: Wikipedia
http://en.wikipedia.org/wiki/Telautograph

The telautograph, an analog precursor to the modern fax machine, transmits electrical impulses recorded by potentiometers at the sending station to stepping motors attached to a pen at the receiving station, thus reproducing at the receiving station a drawing or signature made by by sender. It was the first such device to transmit drawings to a stationary sheet of paper; previous inventions, in Europe, used rotating drums to make such transmissions

I worked as a broadcast engineer at KOAM-TV is Pittsburg, Kansas.  I was only 16 and was a First Class FCC licensed engineer. My favorite vacuum tube was the Iconoscope used in the film projector cameras.  I still own that beautiful work of glass and metal.

Iconoscope Camera Tube.

From Wikipedia
http://en.wikipedia.org/wiki/Iconoscope

Patent diagram of Zworykin's Iconoscope, 1931. The image entered through the series of lenses at upper right, and hit the photoelectric cells on the image plate at left. The cathode ray at the right swept the image plate, charging it, and the photoelectric cells emitted an electric charge in variance with the amount of light hitting them. The resulting image signal was carried out the left side of the tube and amplified.The Iconoscope was the name given to an early television camera tube in which a beam of high-velocity electrons scans a photoemissive mosaic. A research group at RCA headed by Vladimir Zworykin introduced the Iconoscope in 1934 [1], after visiting Philo Farnsworth's lab and examining in 1930 how the world's first electronic television camera had been designed, for a potential licensing deal for his new employer, RCA. The Iconoscope was a leading camera tube used for broadcasting in the United States from 1936 until 1946.