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Patent 2280215: Cover (40Kb) (PDF)
Patent 2280215: Abstract (28Kb) (PDF)
Patent 2280215: Claims (99Kb) (PDF)
Patent 2280215: Background (522Kb) (PDF)
Patent 2280215: Drawings (217Kb) (PDF)
Patent 2280215: Cover Drawing (10Kb) (PDF)
Patent 2280215: Full Patent (911Kb) (PDF)
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