Name | Role | Place | Source | |
---|---|---|---|---|
Willem Leffen | Employee | 1750 | Amsterdam | Personnel-administration |
Willem van Leffen | Employee | 1721 | Delft | Personnel-administration |
Willem van Leffen | Employee | 1773 | Delft | Personnel-administration |
Willem van Leffen | Employee | 1724 | Delft | Personnel-administration |
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