The aircraft carriers of the Nimitz Class are the largest warships currently in service in the world. At around $4.5 billion each, these carriers are the most expensive ship on this list. The ten ships of this class help the United States flex its military muscle around the world.
Introduction to China Jaw Crusher. Jaw crushers machine are invented in 1858 and first widely applied in road paving and then in mines.
African-American Willis Johnson of Cincinnati, Ohio, patented and improved the mechanical egg beater (U.S. pat# 292,821) on February 5, 1884. The beater was made up of a handle attached to a series of spring-like whisk wires used to help mix ingredients.