1st Internship of Johannes Jacobus Ludovicus Christiani1st Internship of Evert Jan de Geest2nd Internship of Dirk Hermant1st Internship of Isaac Titus Timotheus Gill1st Internship of Gerardus Johannes Loohuis1st Internship of Jan Petrus Gerardus van Lewe1st Internship of Carel Wilhelm Meijer1st Internship of Johannes Plakkée2nd Internship of Doris van Raamsdonk1st Internship of Franciscus Joh. de Ruyter3th Internship of Dirk Jan Jacob Snabilié1st Internship of Willem Bijvank