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         Hendricus Maria Johannes Schipper & Clazina Johanna Verhage          
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 Petrus Ernest Cornelis Schipper    Hendrikus Johannes Schipper & Apolonia    
         & A.J. Driehuis                  Joanna Maria van der Lubbe          
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    Eduard Gerardus Schipper               Petrus Theodorus Schipper