William de Boreel, who visited Middelburg to research the invention in 1655, interviewed Janssen's son Johannes.
David Janssen | Famke Janssen | Christian Zacharias | Casey Janssen | Zacharias Rhetor | Walter Janssen | Janssen-Cilag | Zacharias Conrad von Uffenbach | Sjef Janssen | Ravi Zacharias | Prix Jules Janssen | Zacharias Longuelune | Zacharias Hildebrandt | Zacharias Heinesen | Pierre Janssen | Franz Zacharias Ermerins | Ernst Zacharias Platner |