Who married Gertrude Tomanek von Beyerfels?

Archduke Joseph Ferdinand of Austria (24 May 1872 – 28 August 1942) was an Austro-Hungarian Archduke, military commander, from 1916 Generaloberst, and early advocate of air power. He later retired to life as a common citizen of Austria, and was briefly imprisoned in Dachau during the Nazi era.