2nd Internship of Christoffel Biesterveld1st Internship of Hendrik Lambertus Blankers3th Internship of Hendrik Lambertus Blankers1st Internship of Gerardus Hogendorp1st Internship of Jan Michaël Augustin3th Internship of Johan Hendrik Koppijn2nd Internship of Cornelis Wilhelmus Koestal1st Internship of Henry Polak2nd Internship of Wilhelm Petrus Raasing1st Internship of Jacob Biesterveld4th Internship of Johannes Antonius van Zoolingen5e Internship of Abraham Boutelje