| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Key | Tewerkgestelde | 's-Gravenhage, Schiedam | Workforce registration | |
| Jan Key | Tewerkgestelde | 's-Gravenhage, Schiedam | Workforce registration | |
| Jan Key | Tewerkgestelde | 's-Gravenhage, Schiedam | Workforce registration | |
| Jan Key | Tewerkgestelde | 's-Gravenhage, Schiedam | Workforce registration | |
| Jan Lodewijk Key | Registered | Culemborg | Population register | |
| Jan Lodewyk Key | Tewerkgestelde | 's-Gravenhage, Schiedam | Workforce registration | |
| Jan Lodewyk Key | Tewerkgestelde | 's-Gravenhage, Schiedam | Workforce registration | |
| Jan-Lodewyk Key | Tewerkgestelde | 's-Gravenhage | Workforce registration |
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