In 1919 at the age of nineteen, Josef Zdenko Dworak, whose father Wenzel Dworak already managed a transport company, founded his own transport company

The sole proprietorship Josef Zdenko Dworak was founded in 1919 by

The transporter Paul David Herzfeld lived with his wife Stefanie at Ausstellungsstraße 45/I/14 in Vienna's 2nd district. He fled in August 1938 via Czechoslovakia to Palestine. He lived in the 1950s in Tel Aviv, where he also died.

After his father's death in 1922, Hans Leinkauf took over Speditionsgeschäft Josef J. Leinkauf in Helferstorferstraße in Vienna's 1st district.