Inventor: Madsen, Christian Hald
Inventor: van der Zwet, Alexius Joannes Joseph
Inventor: van der Zwet, Alexius Joannes Joseph
Inventor: Beekenkamp, Annie Cornelia
Inventor: van der Zwet, Alexius Joannes Joseph
Inventor: Beekenkamp, Annie Cornelia
Inventor: Beekenkamp, Annie Cornelia