Opekta's first demonstration

The first was on 4 July 1933 in the Grand Hotel on Wilhelminaplein in Heerlen. On this day, the company had not yet been formally registered with the Chamber of Commerce. However, it was already established at Nieuwezijds Voorburgwal 120, in the modern Candida building.^[1] Opekta's 'Depot Heerlen' was located at the home of the blind German war invalid Karl Wilhelm Essers.^[2] The product demonstration in Heerlen marked the launch of the intensive marketing campaigns that Opekta continued to conduct for years. After the summer of 1934 the company moved to the address Singel 400.^[3] In the early years, Opekta was the mainstay of Otto Frank's family business.