An industrialist - was arrested by the Gestapo (according to Czerniakow on 27 October 1939) and then found hanged in a casino in Otwock.
An industrialist from Warsaw, arrested by the Gestapo. Czerniakow mentions him once in the note from 27 October 1939: Koenigstein's death.
Hartglas, Apolinary Na pograniczu dwoch swiatow, ed J. Zyndul (In between Two Worlds)
Czerniakow, Adam, Adama Czerniakowa dziennik getta warszawskiego. 6 IX 1939 - 23 VII 1942, (The Warsaw Diary of Adam Czerniakow)