| Name | Role | Place | Source | |
|---|---|---|---|---|
| J.G. Kupper | Buyer | 's-Gravenhage | Verkaufsbücher | |
| J.G. Kupper | Travelers | 1959 | New York | Passenger registers |
| J.G. Kupper | Buyer | 's-Gravenhage | Verkaufsbücher | |
| J.G. Kupper | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| J.G. Kupper | Travelers | 1954 | Rotterdam | Passenger registers |
| J.G. Kupper | Travelers | 1959 | Rotterdam | Passenger registers |
| J.G. Kupper | Travelers | 1954 | Rotterdam | Passenger registers |
| J.G. Kupper | Travelers | 1959 | Rotterdam | Passenger registers |
| J.G. Kupper | Registered | 's-Gravenhage, Lochem | Management file | |
| J.G. Kupper | Registered | 's-Gravenhage, Ampsen | Management file |
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