In facsimile, a frequency modulationsystem where one frequency represents picture black and another frequency represents picture white[?]. Frequencies between these two limits may represent shades of gray
An intentional frequency change used for modulation purposes
... Founded by colonel Alfred Touny[?] in April 1942. He was killed with 12 others in Arras two years later.
Organisation de la Résistance de l'Armée[?] (ORA o ...