1st Internship of Anthony Pieter Blok1st Internship of Willem Hamel1st Internship of Jacob van Gelder1st Internship of Jacobus Groenveld2nd Internship of Willem Marinus de Geest1st Internship of Pieter Gerrits1st Internship of Martinus Roelof de Groene1st Internship of Albert Kat1st Internship of Gerrit Kat1st Internship of Dirk Been1st Internship of Nicolaas Gerrit Kuiper1st Internship of Cornelis Kok1st Internship of Johan T Koster1st Internship of Johannes Jacobus Kuulkers1st Internship of Gerardus Kuiper1st Internship of Antonius Lathouwers1st Internship of Johannes Wilhelmus Berkhout1st Internship of Jan Hendrik Moorman1st Internship of Nicolaas Adriaan Raasing1st Internship of Eijlert Engelbert Uivel1st Internship of Johannes Coenraad Brink