Inventor: Ruiter, Gerrit de
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Inventor: Boerner, Eugene S.
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Inventor: Hahn, Walter S.
Inventor: Ruiter, Gerrit de
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Inventor: Whisler, Milton L.
Inventor: Burbank, Luther, Burbank, Elizabeth Waters
Inventor: Boerner, Eugene S.
Inventor: Boerner, Eugene S.
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Inventor: Armstrong, John S.
Inventor: Kordes, Wilhelm
Inventor: Anderson, Frederic W.
Inventor: Hall, Madelene Alberta