1st Internship of Salomon Barkelo1st Internship of Elkan Joseph Polak1st Internship of David Polak2nd Internship of David Polak3th Internship of David Polak2nd Internship of Alfred Polak1st Internship of Aron Polak4th Internship of David Polak1st Internship of Benjamin Roselaar1st Internship of Albertus Franciscus de Waart3th Internship of Jacob Bril