Name | Role | Place | Source | |
---|---|---|---|---|
A. Meyer-Ploum | Registered | 's-Gravenhage | Management file | |
A.E. Ploum Speck | Registered | 's-Gravenhage | Management file | |
Franken-Ploum | Registered | 's-Gravenhage | Management file | |
G. Hinte-Ploum | Registered | 's-Gravenhage | Management file | |
J. Ploum-Goergens | Registered | 's-Gravenhage | Management file | |
J.W.H. Ploum | Registered | 's-Gravenhage | Management file | |
V.J. Ploum | Registered | 's-Gravenhage | Management file |
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