https://www.ancestry.com/genealogy/records/johan-fredrik-bakker-24-gb1my8
https://www.nationaalarchief.nl/onderzoeken/index/nt00475/AE1166340
He died in 1957: Johan Fredrik Bakker (1903-1957) - Find a Grave Memorial
Death Johan Fredrik Bakker & Mina Dijkgraaf on November 29, 1957 in Apeldoorn (Netherlands) » Open Archives