Top, from left to right: Bob van Popta (patent administration), Mr Kriek (brother of Co Bal-Kriek from secretary and married to Freek Bal), Harry Casemier, an unkonwn friend of Harry, Koos Zuiderwijk and a Belgian patent attorney, Bleukx.
Below, from left to right: Martin de Bruin, Charles van Dalen, Ed van der Plas (bookkeeping), Lambert van der Plas (Ed's brother) and Freek Bal (draughtsman).