Otto Frank rents a room in Amsterdam

In July 1933 Otto Frank started his Nederlandsche Opekta Maatschappij. On the fourth of that month the first demonstration of the new company's product took place in Heerlen. A few weeks later, on 16 August, he formally moved to Amsterdam, where he initially occupied a room in the house of Marianne van Buren, a lodger on Stadionkade. On 5 December he and Edith moved into the house at Merwedeplein 37-II.