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
... He worked with traitor Henri Dericourt[?].
In January 1 1942 Jean Moulin parachuted to Arles with two other men and radio equipment and continued to Marseilles. De ...