Inventor: Hall, Elsie Kazerine
Inventor: Hall, Elsie Kazerine
Inventor: Hall, Elsie Kazerine
Inventor: de Groot, Leonardus S. J.
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Cevasco, Jr., Robert
Inventor: van Diemen, Hubertus T.
Inventor: Koning, Lammert
Inventor: Baars, Johannes