Inventor: Danziger, Gavriel
Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: Danziger, Gavriel
Inventor: Heinrich, Westhoff
Inventor: Cook, Edward Graham, Cook, Esther Ruth
Inventor: Cook, Edward Graham, Cook, Esther Ruth
Inventor: Van Andel, Otto Jan Robert
Inventor: Westhoff, Heinrich
Inventor: Lommerse, Henry
Inventor: Houbraken, Anna M. W. P.