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Premium Seismograph Teaching Model Subcategory_Thermometers Four cylinder equal mass set at 100g Four cylinder equal mass set at 100g each in copper Rubber footed 8 by 5 inch powder coated steel base pairs with a stainless steel 60cm rod at 12mm diameter for a 3 Manually operated seismograph model that traces shock waves onto a pulled paper strip visualizing the relationship between local motion and seismic recording for geology lessons
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