Inventor: Oostveen, Cornelis A.
Inventor: Klemm, Nils, von Tubeuf, Guido
Inventor: Falstad, III, Clarence H.
Inventor: Klemm, Nils, von Tubeuf, Guido
Inventor: Klemm, Nils, von Tubeuf, Guido
Inventor: Falstad, III, Clarence H.
Inventor: van Aart, Marinus Adrianus Cornelis