1) German invention 2) Military radio system
Found on
https://www.crosswordclues.com/clue/hellschreiber
The Hellschreiber or Feldhellschreiber (also Hell-Schreiber named after its inventor Rudolf Hell) is a facsimile-based teleprinter invented by Rudolf Hell. Compared to contemporary teleprinters that were based on typewriter systems and were mechanically complex and expensive, the Hellschreiber was much simpler and more robust, with only two moving...
Found on
http://en.wikipedia.org/wiki/Hellschreiber
No exact match found.
