During the event, a picture was made to commemorate the event. However, for reasons unknown the picture was never published in the memorial book or even distributed to the management or employees. So, for the first time, 55 years after it was taken: the picture of the management, their wives and the employees of Nederlandsch Octrooibureau, 75 years old!
And of course the question remains: who prevented this picture from being seen and why?