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The connections between the base pairs are also clearly shown
Premium Quality: Pulley on Rod is made of high-grade construction all the way through
a buzzer will sound
laboratory
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Sand Timer, 3 Minutes, Yellow Microscope Accessories The connections between the baseSand Timer. 3 Minutes. Premium Quality: Sand Timer is made of high quality, heavy duty and durable materials. Designed for use in science classrooms, household and educational settings. If you need custom order with different sizes design, please contact us. Safely Packaged to avoid being damaged during transportation.
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