बालुवा समयक
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बालुवा समयक (अङ्ग्रेजी: hourglass, sandglass, sand timer) समय मापनको एक साधन अथवा औजार हो।
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विकिमिडिया कमन्समा बालुवा समयक सम्बन्धी अन्य सामग्रीहरू रहेका छन्। |