Name | Role | Place | Source | |
---|---|---|---|---|
Albertus Helfenstein | Registered | Kreis Oberhausen | Workforce registration | |
Christiaan Helfenstein | Registered | 's-Gravenhage | Workforce registration | |
Hendrik Helfenstein | Registered | 1912 | Amsterdam | Workforce registration |
Hendrik J.J. Helfenstein | Registered | 1912 | Amsterdam | Workforce registration |
Hendrik J.J. Helfenstein | Registered | 1912 | Amsterdam | Workforce registration |
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