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TOKYO — Kazuo Kashio, one of four brothers who founded Casio Computer Co., the Japanese company behind G-Shock watches, has died at age 89.

Kashio, who was chairman and served previously as president, died at a Tokyo hospital on Monday of aspiration pneumonia, which is set off by breathing in food or liquids, the company announced Tuesday.

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Kashio is credited with making the calculator an everyday product through Casio Mini. He also helped popularize G-Shock, which has grown into an internationally recognized brand since its 1983 debut.

Kazuo Kashio succeeded his older brother Tadao, who served as Casio’s second president. The first president was the brothers’ father.

G-Shock still commands a following, 35 years later, despite the advent of smartphones and other devices that tell time and are making watches less of a must-have item.

It is still favoured by people who praise its durability and accuracy.