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G-Shock
G-Shock is a brand of watches manufactured by Casio, known for its resistance to shocks (e.g. hard knocks and strong vibrations). Its full form is Gravitational Shock. They are designed primarily for sports, military and outdoor adventure oriented activity; nearly all G-Shocks have some kind of stopwatch feature, countdown timer, light and water resistance.
==History==
The first G-Shock was made in the 1983 Casio DW-5000C designed by an engineer working for Casio named Kikuo Ibe,〔(【引用サイトリンク】title=Smashing success )〕 around the triple ten concept: the concept for a watch that has a 10 year battery life, is water resistant to 10 bar, and can survive a 10m fall onto a hard surface. 200 prototypes were tested by dropping them from rooftops, or third story windows.
Its shock resistant design has 10 layers protecting the quartz time mechanism,〔 the major ones being the urethane rubber outer bumper protecting the steel watch case, the stainless steel case, the hardened mineral glass watch crystal, the stainless steel screwed down caseback, and the "floating module" concept where the quartz mechanism floated free in a urethane foam cradle, with things like the outer buttons, and LCD module attached with flexible cables, with the buttons mounted to the watchcase, rather than the quartz module. It was released in April 1983, seizing the unfilled recreational and sporting market for bulky, functional watches. For the next few years Casio released a handful of new models each year. The Baby-G models were released in 1991. The popularity of G-Shocks increased rapidly throughout the 1990s. By 1998, 19 million G-Shocks had been sold worldwide〔(【引用サイトリンク】title=The clock is ticking at Casio )〕 and there seemed to be a peak in demand as over 200 new models were released in that year alone.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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