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
... and Moscow, Russia, with an inventory of 12,000 titles.
1904 in literature
1904 in music
1904 in sports
The second Summer Olympic Games are held in St. Louis, ...