| Name | Role | Place | Source | |
|---|---|---|---|---|
| Michiel J. Proost | Registered | 1923 | Amsterdam | Workforce registration |
| Michiel Proost | Registered | 1635 | Bergen op Zoom | Notarial records |
| Michiel Proost | Registered | 1508 | Breda | Vestbrieven |
| Michiel de Proost | Registered | 1509 | Breda | Vestbrieven |
| Michiel de Proost | Partner | 1847 | Arendonk | Civil registration deaths |
| Michiel-Johs. Proost | Tewerkgestelde | 's-Gravenhage | Workforce registration |
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