[1] The business expanded following World War I, acquiring a share in Phoenix AG für Bergbau und Hüttenbetrieb (Mining and Iron Works) in 1917 and taking a 50% share in the Russo-German joint venture, Deutsch-Russische Handels-AG (Russgertorg) in October 1922, which was promoted by Lenin himself.

[2] By means of this largest Soviet joint venture he could prove that the foreign trade monopoly was not a handicap as his opponents claimed.

[3] In the negotiations with MICUM Wolff did not support Stinnes' commission of six but decided to make a “separate peace” with the French delegation.

[4] Under the new National Socialist regime in 1933, Strauß was expropriated, being forced to sell his shares underpriced to Otto Wolff.

Otto Wolff Handelsgesellschaft mbH is located in Essen with the following history: In 1993, it relocated from Cologne to Düsseldorf.