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Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and photocopiers, but for many years they were the primary means of reproducing documents for limited-run distribution. The duplicator was pioneered by Thomas Edison and David ...
Shades of purple. There are numerous variations of the color purple, a sampling of which is shown below. In common English usage, purple is a range of hues of color occurring between red and blue. [1] However, the meaning of the term purple is not well defined. There is confusion about the meaning of the terms purple and violet even among ...
Benjamin Franklin — George Washington The First U.S. Postage Stamps, issued 1847. The first stamp issues were authorized by an act of Congress and approved on March 3, 1847. [20] The earliest known use of the Franklin 5¢ is July 7, 1847, while the earliest known use of the Washington 10¢ is July 2, 1847.
Since then, the month of March has gone purple, green and white in honor of the women who've paved the way — and continue to do so today. “The use of the colors purple, green, and white to ...
The United States five-dollar bill (US$5) is a denomination of United States currency. The current $5 bill features U.S. president Abraham Lincoln and the Great Seal of the United States on the front and the Lincoln Memorial on the back. All $5 bills issued today are Federal Reserve Notes. As of December 2018, the average life of a $5 bill in ...
History of color printing. Woodblock printing on textiles preceded printing on paper in both East Asia and Europe, and the use of different blocks to produce patterns in color was common. The earliest way of adding color to items printed on paper was by hand-coloring, and this was widely used for printed images in both Europe and East Asia.
This template is placed at the bottom of the Timeline of United States history articles to aid navigation in the series. This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute ), it is hidden apart from its ...
Line of purples. In color theory, the line of purples or purple boundary is the locus on the edge of the chromaticity diagram formed between extreme spectral red and violet. Except for these endpoints of the line, colors on the line are non-spectral (no monochromatic light source can generate them). Rather, every color on the line is a unique ...