Any device that Idzerda made was given a number. Those numbers followed each other. In this booklet Idzerda noted the serial numbers on the equipment which he had sold.
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Details
Title: Booklet with serial numbers from Idzerda
Pages with sold equipment and serial numbers
Creator: Hans Schotanus à Steringa Idzerda, Hanso Schotanus à Scheringa Idzerda
Date Created: 1918-08-01/1933, 1918-08-01/1933
Location: The Hague, The Netherlands, The Hague, The Netherlands