U.S. Pat. No. 267,812
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A 3D model of U.S. Patent Number 267,812 showcases cutting-edge 1882 page holder technology from the original Thingiverse—the U.S. PTO. "To all whom it may concern: Be it known that we, CELIA J.B. WHITEHEAD and EMORY J. WHITEHEAD, citizens of New Jersey, United States of America, residing at Bloomfield in Essex County and State of New Jersey, have invented certain new and useful Improvements in Book-Holders; and we hereby declare the following to be a full, clear, and exact description of our invention, enabling others skilled in this art to make and use it.
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