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Ramón Verea (b December 11, 1833, in La Strada, Pontevedra, d 6 February 1899 in Buenos Aires.). - Spanish inventor, creator of the world's first calculator.

Ramon Verea lived in the nineteenth century, at the age of 21 lived in Cuba and then in New York. In 1878 he constructed the calculator multiplying the number directly, rather than through multiple summation. Made of stainless machine weighs approx. 23 kg.

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Toothpaste was used as long ago as 500 BC in both China and India; however, modern toothpastes were developed in the 1800s. In 1824, a dentist named Peabody was the first person to add soap to toothpaste. John Harris first added chalk as an ingredient to toothpaste in the 1850s. In 1873, Colgate mass-produced the first toothpaste in a jar. In 1892, Dr. Washington Sheffield of Connecticut manufactured toothpaste into a collapsible tube.

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Invented around 1500 BC in ancient Egypt. They were made of bronze  blades connected at the handles by a thin. Robert Hinchliffe is father of modern scissors made of steel.

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http://inventors.about.com/od/astartinventions/a/FamousInvention.htm

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Mr Warner came from the USA. He was an inventor. He invented the first tin opener in 1858. His opener was big rather big and quite heavy. Now can openers are smaller.

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He came from the USA. He was an engineer. He invented air conditioning in 1902. The first air conditioner was big and it worked in a printing plant. Now people use a lot of air conditioners everywhere in the world.