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Inventor: de Boer, Petrus
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Inventor: Danziger, Gabriel
Inventor: Danziger, Gabriel
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Inventor: Hooijman, Aloysius A. J.
Inventor: Van Andel, Otto Jan Robert
Inventor: Bartels, Gosen B. H.
Inventor: Danziger, Gabriel
Inventor: Danziger, Gabriel
Inventor: Bartels, Goos B. H.
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Inventor: Herrick, Robert D.