| Name | Role | Place | Source | |
|---|---|---|---|---|
| Constant O | Witness | 1879 | Schaarbeek | Civil registration marriages |
| Constant O | Witness | 1885 | Brussel | Civil registration marriages |
| Constant O | Witness | 1882 | Brussel | Civil registration marriages |
| Constant O. van de Pitte | Registered | Apeldoorn | Population register | |
| Constant O. van de Pitte | Registered | Apeldoorn | Population register | |
| Constant Pierre Jean Dall O | Deceased | 1976 | Lesparre-Médoc | Civil registration deaths |
| Constant Pierre Jean Dall O | Deceased | 1976 | Lesparre-Médoc | Civil registration deaths |
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