| Specifications︰ | The seismograph is generally held to be the earliest devise in the world to predict the direction of an earthquake. It was invented by Zhang Heng, an outstanding scientist in Eastern Han Dynasty (25-220 A.D) Overall Size L x W x H or D in (mm) - 310x310x215 Packing rate (pieces per master carton) - 2 Master Carton Size L x W x H in (mm) - 760x390x290 Gross Weight / Net Weight in (Kg) - 12.50 / 9.50
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