Inventor: van der Velden, Josephus M.
Inventor: Schoenmakers, Kees
Inventor: Cornelis, Daniel
Inventor: Hollingsworth, Donald
Inventor: Bradford, Virginia
Inventor: Rudolph, Nathan H.
Inventor: Guldemond, deceased, Cornelius K.
Inventor: Guldemond, deceased, Cornelius K.
Inventor: Carl George Klehm
Inventor: Carl George Klehm