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.
ZIPPER. The design used today, based on interlocking teeth, was invented by an employee of Whitcomb Judson's, Swedish born scientist Gideon Sundback. In 1913 and patented as the Hookless Fastener and after more improvements patented in 1917 as the Separable Fastener.he design used today, based on interlocking teeth, was invented by an employee of Whitcomb Judson's, Swedish born scientist Gideon Sundback. In 1913 and patented as the Hookless Fastener and after more improvements patented in 1917 as the Separable Fastener.