| Name | Role | Place | Source | |
|---|---|---|---|---|
| H. Helmsing | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| H. Helmsing | Passagier | 1946 | Tandjong Priok | Passenger registers |
| H. Helmsing | Belanghebbende | 1811 | Notarial records | |
| Wouter Jan H. Helmsing | Registered | 1826 | Amsterdam | Population register |
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