Inventor: Danziger, Gavriel
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Danziger, Gavriel
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Heinrich, Westhoff
Inventor: Gutter, Martien
Inventor: Gutter, Martien
Inventor: Gutter, Martien