Carbon paper is patented to aid the blind, October 7, 1806 - EDN

On this day in tech history, Ralph Wedgwood received the first patent for carbon paper, which he invented as part of a device to help the blind to write.

portugal not (print on demand or printed on demand) - portugal - First Edition - Not Printed On Demand - AbeBooks

Notabilia: A Blog about Rare Books Princeton University Library – Special Collections – The Scheide Library

Ohio student inventor earns patent for invention

Guide to the Archival Collections.pdf - Missouri History Museum

Benjamin Banneker - Wikipedia

Gifford Pinchot Papers - American Memory - Library of Congress

Ethics: Origin and Development - Peter Kropotkin by Mark Crosby - Issuu

Guide to House Records: Chapter 13

Animal Spirits