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Judson's most noteworthy invention, a chain-lock fastener, was the precursor to the modern zipper which he developed and invented in 1891. [5] Judson is generally recognized as the inventor of the zipper. [6] He also invented a "clasp-locker" automation production machine that made his fastener device inexpensively. [7]
A zipper, zip, or fly, formerly known as a clasp locker, is a commonly used device for binding together two edges of fabric or other flexible material. Used in clothing (e.g. jackets and jeans ), luggage and other bags , camping gear (e.g. tents and sleeping bags ), and many other items, zippers come in a wide range of sizes, shapes, and colors.
In 1891 Chicago inventor Whitcomb L. Judson wanted an easier way to lace up his shoes so he devised a system of hooks and eyes, plus a slide mechanism, to fasten and unfasten the hooks. He exhibited his device at the 1893 World's Columbian Exposition .
The metal zipper is the oldest type of workable zipper, having been invented by Gideon Sundback as an improvement of Whitcomb Judson's "Clasp Locker" that majorly consisted of a hook-and-eye shoe fastener. [1]
Whitcomb Judson (1836–1909), U.S. – zipper Percy Lavon Julian (1899–1975), U.S. – chemical synthesis of medicinal drugs from plants Ma Jun ( fl. 220–265), China – south-pointing chariot (see differential gear ), mechanical puppet theater , chain pumps , improved silk looms
Whitcomb L. Judson (1843–1909), American inventor of the zipper; James Whitcomb Riley (1849–1916), American writer and poet; Places. Whitcomb, Indiana;
The Naval General Service Medal (NGSM) was a campaign medal approved in 1847, for issue to officers and men of the Royal Navy.. The Admiralty retroactively awarded the Naval General Service Medal for various naval actions that occurred during the period 1793–1840, a period that included the French Revolutionary Wars, the Napoleonic Wars, and the Anglo–American War of 1812.
The most common stamps found on gold-filled jewelry are 1 ⁄ 20th 12kt GF and 1 ⁄ 20th 14kt GF. Also common is 1 ⁄ 10th 10kt. These standards are for modern gold-filled items. It is not uncommon to see 1 ⁄ 8 14kt gold-filled marks, plus many other variations, on items from the 1930s, 1940s, etc., which would have to be marked "Rolled ...
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