| Name | Role | Place | Source | |
|---|---|---|---|---|
| Bernard Georg Flacke | Registered | 1851 | Leeuwarden | Population register |
| Bernard Georg Flacke | Registered | 1861 | Leeuwarden | Population register |
| Georg Bernard Flacke | Creditor | 1862 | Het Bildt | Notarial records |
| Georg Bernard Flacke | Registered | 1836 | Leeuwarden | Population register |
| Johan Heinrich Georg Bernard Flacke | Mention | 1868 | Leeuwarden | Notarial records |
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