3th Internship of Mozes Groen2nd Internship of Lodewijk Frederik Theodorus Houtman1st Internship of Isaac Plas2nd Internship of Siegfried Roos3th Internship of Jacques Vos2nd Internship of Mozes Waterman1st Internship of Joël Pach1st Internship of Meyer Knoop1st Internship of Eliazer Peper1st Internship of Louis Boas1st Internship of Arnold de Vries2nd Internship of Arnold de Vries