Lydia Ivanovna Kröker born in Shilesna, Dnepropetrovsk region (according to EWZ file; kinship hypothesis with Emma Ivanovna's family requires confirmation).
Emma Ivanovna Kröker born in the German colony of Uvarovka / Neu-Aleksandrovka in Pulin district of Kyiv region (from 1937 — Zhytomyr region).
Pulin German National Rayon of the Ukrainian SSR — the only administrative unit of its kind in Ukraine, 18 German village councils. Abolished in autumn 1935.
Forced resettlement of the Kröker family from Volhynia to the village of Peski in Dvorichna district, Kharkiv region.
Lydia marries Edmund Dreger in Peski. Son Leo born on 08.06.1937.
USSR resolution on the resettlement of Germans from a number of regions of the Ukrainian SSR.
Deportation of Emma Ivanovna (aged 17) with her mother from the village of Peski to the North Kazakhstan region.
Special settlement in the village of Semipolka, Oktyabrsky district of North Kazakhstan region.
Transfer to the village of Sennoye, Sovetsky district. Emma Ivanovna — milkmaid in the "Kolos" collective farm (from 1946).
Decree of the Presidium of the Supreme Soviet of the USSR "On the Eviction of Germans Forever". Emma's receipt of acknowledgement — 10.05.1949.
Vladimir Usachev born in the village of Sennoye (in the original entry the father is "Vasiliy", identity not established).
Marriage of Emma Ivanovna to Nikolai Maksimovich Usachev — becomes Vladimir's stepfather. Father entry in son's birth certificate rewritten.
Decree of the Presidium of the Supreme Soviet of the USSR on removing restrictions on Germans and their families in special settlement.
Emma Ivanovna released from special settlement at the Kaplinskaya commandant office. Ban on residence in Kharkiv region remains for life.
Emma Ivanovna moves with six-year-old Vladimir to the village of Dubovskoye in Dubovsky district of Rostov region, to her sister Zinaida Ivanovna Simentsova.
Vladimir Nikolaevich studies at the Kupiansk Tractor Vocational School (Kharkiv region, Ukrainian SSR).
Emma Ivanovna issued a restored birth certificate in Dubovsky district — for the first time in a Soviet document her father's name is recorded: Kröker Ivan Ivanovich.
Vladimir — driver of the Ikarus bus on the Rostov — Kharkov route.
Vladimir moves with his wife Lyubov (née Kryshka) to the city of Shakhty in Rostov region. Vladimir — driver of a GAZ-66 in a geological exploration expedition (surveying work). Lyubov works at the Shakhty Cotton Mill (KhBK).
Vladimir Nikolaevich Usachev takes part in the liquidation of the consequences of the Chernobyl nuclear disaster. Receives 2nd group disability, liquidator certificate, medal "For Participation in the Liquidation of the Consequences of the Chernobyl Disaster".
Death of Emma Ivanovna Kröker in the village of Dubovskoye at the age of 62 (death certificate IV-AN No. 253338, cause: chronic cerebrovascular insufficiency). Buried in Dubovskoye.
Russian Federation Law No. 1761-I "On the Rehabilitation of Victims of Political Repression".
Emma Ivanovna Kröker posthumously rehabilitated.
Eugen Usachew moves to Berlin. 11.12.2019 — official name change to "Eugen Usachew" (Bundesverwaltungsamt).
Death of Vladimir Nikolaevich Usachev in Shakhty.
EWZ documents of Lydia Dreger obtained from MHSBC Canada (film B019, frames 1340–1353).
Full personal file of special settler Kröker E.I. No. 1229 obtained (28 sheets, HDA MVS Ukrayiny, F.161 V.1 file 877) — through a complaint to the Ukrainian Ombudsman.
Proceedings of the Ukrainian Ombudsman E-25482.3/26 closed.
Entry for Emma Ivanovna Kröker created in the Open List of repressed in the USSR.