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Key Points Who Was John Pfeifer? John Pfeifer was a bookkeeper and a remarkable inventor with over 60 patents to his name. […]
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David Nelson In April of 1860, David R. Nelson of Jackson, Ohio, patented (US patent №28006) a keyboard machine for […]
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: Nystrom’s Calculator In the late 1840s the young Swedish immigrant, John William Nystrom, who lived in Philadelphia, invented a calculating […]
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: Max Mayer In 1881 the German inventor Max Mayer from Munich devised an adding machine, which was patented in 1884 […]
The Apparatus for Making Calculations of Francis Marston In 1842 a certain Francis Marston of Aston, Parish of Hopesay, County of […]
Who Was William Macnider? In 1884, John Macnider of Greensborough, Georgia, applied for a patent for a keyboard adding machine. […]
: Ernest-Narcisse Lobbé In the early 1850s Ernest-Narcisse Lobbé, a Parisian watchmaker and mechanic, created one of the first keyboard calculating […]
: Who was Peter Lindholm? Peter Trulson Lindholm was born on April 4th, 1850, in Ysone, Blekinge, Sweden. Lindholm emigrated to […]
Who Was Melvin Lovell? Born in Pennsylvania in August 1844, Melvin Lovell was a successful businessman and woodenware manufacturer who […]
: Locke Adder Clarence E. Locke (1866-1945) from Kensett, Iowa, USA, was a holder of 2 US and 2 German patents […]
: Gustavus Linderoos On August 11, 1871, Captain Gustavus Linderoos (1818-1885) from Point Arena, Mendocino, California, filed a patent application for […]
: Who Was Leonard Nutz? Born Leonard Nice Nutz, he was an inventor and machinist born in October 1810 in Germantown. From […]
: Born in the city of Dresden, Sachsen, Deutschland on September 14, 1845, Friedrich Oskar Leuner was born to Carl […]
Who Was Otto Lilienthal? No mistake, yet another celebrity should be mentioned as an inventor of calculating device, after Leonardo […]
: Unfortunately, we don’t know a lot about Niels Larsen apart from his patents and inventions. From what we do […]
: Charles Labofish In the late 19th and early 20th century Charles Schachan Labofish, a Jewish immigrant from Odessa, Russian Empire, […]
In 1899 french engineer Georges Lafond from Paris patented (German patent DE148810, US patent US653250 and Swiss patent CH19395) […]
Who Was Samuel Kelso? Samuel Kelso was an inventor from Scotland who immigrated to Canada and later to the United […]
Who is William Lang? William Lang was a leading noise control engineer at IBM and a fellow of the American […]
Henry Alonzo House Key Facts: Henry Alonzo House (1840-1930) (see biography of Henry Alonzo House) was an extremely prolific American inventor, who […]
: Lewis Hosea and William Beardsley On 3 March 1891, Lewis Hosea (see biography of Lewis Hosea), a lawyer and amateur […]
: While the 20th century saw inventors and mathematicians get closer and closer to the modern calculators and computers we […]
: Jehu Hatfield was an inventor during the 19th century. While he was working with spittoons, pottery, and Lucifer matches, […]
: Christian Hergenroeder On October 10, 1882, a patent for a simple adding device (US patent 263904) was granted to Christian […]
