Title: Key Jigsaw Puzzle
About: This new puzzle features key placed on top of a tree log. The first key and lock were made out of wood some 4,000 years ago. The first all-metal lock appeared between the years 870 and 900, and are attributed to the English craftsmen. Today keys are more advanced and of various types, some important ones are: house keys (pin tumbler locks), car keys (power door locks), master keys, control keys, transponder keys, double-sided keys, four-sided keys, paracentric keys, internal cut keys and skeleton keys.
Puzzle of the day on: 22-Sep-2013
Image Credit: Public Domain
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