| In Hirokawa-Aoishi mining site, we are mining environmentally friendly natural stone "Hirokawa-Aoishi (light-green stone)".
| | "Hirokawa-Aoishi" is used in various scenes and various places, it helps environmental preservation, and it also gives a beautiful coloration to the city and river landscape.
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Natural stone: "Hirokawa-Aoishi"
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Japanese garden using "Aoishi"
and "Foamed Glass"
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Ohtsubo GSI Co., Ltd.