The firm of Meisenbach, Riffart, founded by Heinrich Riffart (1860-1908) purchased rights to Klics photogravure process simultaneously with the Annans. Born the son of a publisher in Munchen Gladbach, Riffart had studied chemistry in Vienna and Salzburg; see.
J. M. Eder, A History of Photography, trans. E. Epstean, New York: Columbia University Press 1945, p. 599, p. 805
Steel, David. "Karel Klič and Thomas Annan in Vienna," History of Photography. 27.2 (2003): 166-171. Print.