Gertrud Hirsekorn, b: 1884 -

^{1922 USSR formed by Soviet states}
^{1939 - 1945 World War II}
^{1945 Atomic bomb detonated (Hiroshima)}
^{1950 Korean War begins}
^{1964 - 1973 Vietnam War}

^{1895 Marconi invents wireless telegraphy}
^{1899 Boer War begins}
^{1903 Wright brothers 1st plane flight}
^{1912 Titanic sinks on maiden voyage}
^{1914 - 1918 World War I}

^{1830 French Revolution}
^{1837 Queen Victoria assumes throne}
^{1854 Crimean War with Russia}
^{1869 Opening of Suez Canal}
^{1871 Franco - Prussian War}




	^Max Lehrer^{b. d.}

^{Irmgard Lehrer}^b.1909 d.

^{Marianne Lehrer}^b.1911 d.

		^{Simon Hirsekorn}^{b.1854 d.1909 Berlin, Germany}

	^{Gertrud Hirsekorn}^b.1884 d.		^{Alexander Bielschowsky}^{b.1836 d.1904}

		^{Klara Bielschowsky}^b.1863 d.	^{Dorothea Haase}^{b.1842 d.1930}