Inventor: Oostveen, Cornelis A.
Inventor: van der Velden, Josephus M.
Inventor: McDonald, Daniel Bede
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Inventor: Schoenmakers, Kees
Inventor: Cornelis, Daniel
Inventor: Fick, Paul Johannes Hendrik
Inventor: Hollingsworth, Donald
Inventor: Bradford, Virginia
Inventor: Rudolph, Nathan H.