Joseph Polak and five of his brothers owned a company that produced among other things pyjamas. The company was located in Amsterdam on the Herengracht 110. Joseph Polak and his five brothers didn't survive the war.
Addition of a visitor of the website
In addition, a Jokos file (number 3279) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.