The lever design may derive from blacksmiths' pincers. By the 14th century in Europe, nutcrackers were documented in England, including in the Canterbury Tales, and in France. Hinged lever nutcrackers, often called a "pair of nutcrackers", may date back to Ancient Greece. These are also used for cracking the shells of crab and lobster to make the meat inside available for eating. Manufacturers produce modern functional nutcrackers usually somewhat resembling pliers, but with the pivot point at the end beyond the nut, rather than in the middle. Some nuts such as walnuts can also be opened by hand, by holding the nut in the palm of the hand and applying pressure with the other palm or thumb, or using another nut. Nuts were historically opened using a hammer and anvil, often made of stone. A Crackerjack nutcracker, which uses a ratchet
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