Philip Jacques van Geldere took over the bookshop of the Garnade brothers in 1930. Three years later he established the shop under the name 'Technische boekhandel v. h. Gebr. Garnade' at the Binnenwatersloot 28.'
See: J. Wijnberg-Stroz en M. van Lunteren-Spanjaard, Blijvers en voorbijgangers. Joden …
In addition, a Jokos file (number 13542) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.