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KEYWORDS: SCIENCE, HEALTH & TECHNOLOGY

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Date Format Image Collection
October 12, 1899 Engraving  Man sitting at desk receiving sorted punch cards, Visual Still
October 12, 1899 Engraving  A mechanism for counting, a numbered dial on front. Visual Still
October 12, 1899 Engraving  Mechanism with punch on a lever. Visual Still
October 12, 1899 Engraving  Mechanism for punching cards on table. Visual Still
September 1899 Article    Document
April 1897 Article    Document
1897 Pamphlet    Document
December 25, 1894 Patent    Document
December 25, 1894 Patent  Design drawing for S.A. Potter Invalid Chair, sheet 1. Visual Still
December 25, 1894 Patent  Design drawing for S.A. Potter Invalid Chair, sheet 2. Visual Still
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