These four February 22, 1996 32c stamps (Sc #s 3061-4) of the USA commemorate 'Pioneers of Communication'. Their photographic images, signatures and samples of their work are shown.
upper left: Frederic E. Ives (1856-1937), halftone process (#3063)
upper right: William Dickson (1860-1935), motion pictures (#3064)
lower left: Eadweard Muybridge (1830-1904), photography (#3061)
lower right: Ottmar Mergenthaler (1854-1899), linotype (#3062)