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During the year 1930 there was one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees the period introduced two Mirrleesengines represented this patent type of the valve engine. Well the first kind had bore of around 5.5 inches and developed a stroke of just about 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. the other had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder on the rate of 200 r.p.m. Between June 25 and 26, 1876, a combined force of Lakota and Northern Cheyenne led the United States 7th Cavalry in to a battle near the Little Bighorn River as to what was then the eastern edge of the Montana Territory. The engagement is well known by several names: the Battle of Greasy Grass, the Battle of Little Big Horn, and Custer's Last Stand. Perhaps the most well-known action from the Indian Wars, it was an extraordinary victory for Sitting Bull and the forces. They defeated a column of seven-hundred men led by George Armstrong Custer; five in the Seventh's companies were annihilated and Custer himself was killed within the engagement in addition to a couple of his brothers plus a brother-in-law. Known as the battle that left no white survivors, Little Big Horn has inspired over 1,000 pieces of art, including over 40 films. Here are four with the best... There are many reasons why geology is essential in life and to civilization. Think about earthquakes, landslides, floods, droughts, volcanic activity, ocean water currents (el Ni??o), kinds of soil, fuel oils, minerals (gold, silver, uranium), and the like. Geologists study all of these concepts. Thus, the research into geology plays a crucial role in todays modern life and civilization.