Abraham de Swaan was the son of Benedictus de Swaan and Eva Wolf. he was a merchant in flowers. Later he started a radio shop.
Addition of a visitor of the website
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a radio shop, address: Zeedijk 94 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives