2nd Internship of Philip Kool1st Internship of Abram Rootveld1st Internship of Jacob Veffer1st Internship of Jacob Veffer1st Internship of Jozef Veffer1st Internship of Jacob Fokkie1st Internship of Philip Veffer1st Internship of Hartog Veffer1st Internship of Meijer Wurms1st Internship of Maurits Boas3th Internship of Maurits Boas1st Internship of Samuel van den Bijl