For students to make/record earthquake waves. The devices draws zip-zap if ground shakes. The stronger the shaking, the sharper the zig-zags. This zig-zag picture made on the paper roll is called a seismogram.
We have 70 skillful operators, 5 machine mechanics and 31 quality inspectors, total annual output capacity in design can reach 130 millions sets.
Earth & Space Science
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