He is married to Maria Suzanna Hartmann.
They got married on October 7, 1927 at Hengelo, Overijssel, Nederland, he was 26 years old.Source 3
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Johan Heinrich Hartmann | |||||||||||||||||||||||||||||||||||
1927 | |||||||||||||||||||||||||||||||||||
Maria Suzanna Hartmann | |||||||||||||||||||||||||||||||||||

Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I23942.php
Geboorte, Emmen, 24-06-1901, aktenummer 426
Kind: Johan Heinrich Hartmann, geboren te Barger Compascuum (Emmen) op 23-06-1901, zoon van Johann Heinrich Hartmann, beroep: arbeider; oud: 34 jaar, en Maria Elisabeth Wessels, beroep: zonder.