Inventor: Keeter, Thomas, Hubbard, Agnes
Inventor: van Rijn, Magdalena J. M.
Inventor: Stemkens, Henricus G. W.
Inventor: Stemkens, Henricus G. W.
Inventor: Stemkens, Henricus G. W.
Inventor: Stemkens, Henricus G. W.
Inventor: van Rijn, Magdalena J. M.