| Name | Role | Place | Source | |
|---|---|---|---|---|
| A. Fa. (Bankkommandit-Gesellschaft) (I) Hacker & Co | Registered | 's-Gravenhage, Wien | Management file | |
| I. Hacker | Travelers | 1966 | Rotterdam | Passenger registers |
| I. Hacker | Travelers | 1961 | New York | Passenger registers |
| I. Hacker | Travelers | 1968 | Rotterdam | Passenger registers |
| I. Hacker | Travelers | 1904 | Rotterdam | Passenger registers |
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