| Nom | Rôle | Lieu | Source | |
|---|---|---|---|---|
| Robert Theodor Alexander Engelhardt | Marié | 1894 | Rotterdam, Tölk (Lijland Rusland) | L'état civil des mariages |
| Robert Theodor Alexander Engelhardt | Marié | 1894 | Rotterdam | L'état civil des mariages |
| Theodor Engelhardt | Inscrit | 1900 | Nijmegen | Registre de la population |
| Theodor Engelhardt | Inscrit | 1910 | Nijmegen | Registre de la population |
| Theodor Engelhardt | Inscrit | 's-Gravenhage | Studbooks | |
| Theodor Friedrich Engelhardt | Inscrit | 1896 | 's-Hertogenbosch | Gevangenisregister |
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