Facsimile-tape mechanical scanning is actually a byproduct of the Baudot printer art. Siemens-Halske and Teletype have been active in this field.
The following references, although not numerically large, cover the art very well.
Siemes-Halske (Br. Patent 427, 257, Siemens, Halske)
International Inventions (Br. Patent 380, 217 International Inventions)
Kleinschmidt (U.S. Patent 2,046,328, E.E. Kleinschmidt)
(C) Marius Rensen